$TXNM
TXNM ENERGY INC Stock $txnm

$txnm Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000110842612000014 Filed on February 29, 2012

Income Statement

Concept	2011 Q4	2011	2010 Q4
Revenue	$347.9M	$1.701B	$380.7M
YoY Change	-8.61%	1.62%	-0.61%
Cost Of Revenue		$692.9M
YoY Change
Gross Profit		$1.008B
YoY Change
Gross Profit Margin		59.25%
Selling, General & Admin	$60.80M	$257.8M	$68.20M
YoY Change	-10.85%	-2.57%	-3.67%
% of Gross Profit		25.58%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$43.40M	$195.4M	$48.10M
YoY Change	-9.77%	5.0%	13.98%
% of Gross Profit		19.39%
Operating Expenses	$283.9M	$1.422B	$330.8M
YoY Change	-14.18%	-0.85%	-4.7%
Operating Profit	$63.94M	$257.3M	$49.89M
YoY Change	28.16%	7.45%
Interest Expense	-$27.80M	$124.8M	-$222.0M
YoY Change	-87.48%	-0.42%	307.34%
% of Operating Profit	-43.48%	48.52%	-445.0%
Other Income/Expense, Net	-$11.30M	$24.72M	-$2.300M
YoY Change	391.3%	95.22%	0.0%
Pretax Income	$199.7M	$312.5M	-$174.4M
YoY Change	-214.51%	-593.02%	726.54%
Income Tax	$84.30M	$121.5M	-$69.60M
% Of Pretax Income	42.21%	38.9%
Net Earnings	$112.0M	$176.4M	-$108.2M
YoY Change	-203.51%	-490.05%	370.42%
Net Earnings / Revenue	32.19%	10.37%	-28.42%
Basic Earnings Per Share	$1.36	$1.98	-$1.18
Diluted Earnings Per Share	$1.35	$1.96	-$1.18
COMMON SHARES
Basic Shares Outstanding	86.67M shares	89.20M shares
Diluted Shares Outstanding		89.76M shares

Balance Sheet

Concept	2011 Q4	2011	2010 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$15.10M	$15.10M	$15.40M
YoY Change	-1.95%	-1.95%	4.76%
Cash & Equivalents	$15.09M	$15.10M	$15.40M
Short-Term Investments
Other Short-Term Assets	$33.40M	$139.5M	$96.11M
YoY Change	-65.25%	-36.79%	-51.8%
Inventory	$54.23M	$54.20M	$52.48M
Prepaid Expenses
Receivables	$87.79M	$87.80M	$97.25M
Other Receivables	$166.2M	$166.2M	$158.1M
Total Short-Term Assets	$462.8M	$462.8M	$543.9M
YoY Change	-14.9%	-14.91%	-5.94%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.632B	$3.632B	$3.452B
YoY Change	5.21%	5.21%	3.33%
Goodwill	$278.3M		$321.3M
YoY Change	-13.39%		0.0%
Intangibles	$0.00		$26.43M
YoY Change	-100.0%
Long-Term Investments	$260.1M	$260.1M	$279.6M
YoY Change	-6.97%	-6.97%	-43.59%
Other Assets	$571.6M	$571.6M	$602.1M
YoY Change	-5.07%	-5.07%	0.74%
Total Long-Term Assets	$4.742B	$4.742B	$4.681B
YoY Change	1.29%	1.29%	-2.1%
TOTAL ASSETS
Total Short-Term Assets	$462.8M	$462.8M	$543.9M
Total Long-Term Assets	$4.742B	$4.742B	$4.681B
Total Assets	$5.205B	$5.205B	$5.225B
YoY Change	-0.39%	-0.39%	-2.52%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$103.1M	$103.1M	$95.97M
YoY Change	7.47%	7.4%	-13.85%
Accrued Expenses	$53.10M	$53.10M	$47.80M
YoY Change	11.09%	11.09%	5.52%
Deferred Revenue
YoY Change
Short-Term Debt	$82.70M	$82.70M	$222.0M
YoY Change	-62.75%	-62.75%	12.12%
Long-Term Debt Due	$2.387M	$2.400M	$2.252M
YoY Change	5.99%	4.35%	7.24%
Total Short-Term Liabilities	$373.3M	$373.3M	$520.1M
YoY Change	-28.23%	-28.23%	-7.66%
LONG-TERM LIABILITIES
Long-Term Debt	$1.672B	$1.672B	$1.564B
YoY Change	6.91%	6.91%	-0.1%
Other Long-Term Liabilities	$846.7M	$846.7M	$867.8M
YoY Change	-2.43%	-2.43%	2.13%
Total Long-Term Liabilities	$1.672B	$2.518B	$1.564B
YoY Change	6.91%	3.57%	-35.25%
TOTAL LIABILITIES
Total Short-Term Liabilities	$373.3M	$373.3M	$520.1M
Total Long-Term Liabilities	$1.672B	$2.518B	$1.564B
Total Liabilities	$3.537B	$3.619B	$3.492B
YoY Change	1.29%	1.18%	-2.98%
SHAREHOLDERS EQUITY
Retained Earnings	$447.7M		$314.9M
YoY Change	42.14%
Common Stock	$1.193B		$1.290B
YoY Change	-7.54%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.574B	$1.586B	$1.537B
YoY Change
Total Liabilities & Shareholders Equity	$5.205B	$5.205B	$5.225B
YoY Change	-0.39%	-0.39%	-2.52%

Cashflow Statement

Concept	2011 Q4	2011	2010 Q4
OPERATING ACTIVITIES
Net Income	$112.0M	$176.4M	-$108.2M
YoY Change	-203.51%	-490.05%	370.42%
Depreciation, Depletion And Amortization	$43.40M	$195.4M	$48.10M
YoY Change	-9.77%	5.0%	13.98%
Cash From Operating Activities	$93.70M	$292.2M	$70.80M
YoY Change	32.34%	1.7%	2428.57%
INVESTING ACTIVITIES
Capital Expenditures	-$90.60M	-$326.9M	-$100.2M
YoY Change	-9.58%	16.13%	7.28%
Acquisitions
YoY Change
Other Investing Activities	$315.3M	$17.00K	-$5.000M
YoY Change	-6406.0%	-100.85%	-200.0%
Cash From Investing Activities	$224.6M	$19.78M	-$105.1M
YoY Change	-313.7%	-107.17%	18.76%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$125.7M	$125.7M
YoY Change
Debt Paid & Issued, Net		$110.8M
YoY Change		-72.72%
Cash From Financing Activities	-329.0M	-$312.3M	24.60M
YoY Change	-1437.4%	2823.63%	-18.27%
NET CHANGE
Cash From Operating Activities	93.70M	$292.2M	70.80M
Cash From Investing Activities	224.6M	$19.78M	-105.1M
Cash From Financing Activities	-329.0M	-$312.3M	24.60M
Net Change In Cash	-10.70M	-$313.0K	-9.700M
YoY Change	10.31%	-141.02%	-82.55%
FREE CASH FLOW
Cash From Operating Activities	$93.70M	$292.2M	$70.80M
Capital Expenditures	-$90.60M	-$326.9M	-$100.2M
Free Cash Flow	$184.3M	$619.1M	$171.0M
YoY Change	7.78%	8.84%	77.75%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2010Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	95969000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	103139000	USD
CY2010Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	97245000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	87794000	USD
CY2011Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	15771000	USD
CY2010Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	18089000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	14340000	USD
CY2010Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	12628000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	16211000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	15634000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-58000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-1623000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-82432000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-83254000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-68666000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-66856000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2200000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6200000	USD
CY2009	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2200000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	11178000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1778000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	-24116000	USD
CY2009	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	-44071000	USD
CY2010	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	-27566000	USD
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1591648000	shares
CY2009Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	70963000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	76637000	USD
CY2008Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	63675000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	79233000	USD
CY2009	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5751000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6114000	USD
CY2010	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6019000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	60000	USD
CY2009	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	3464000	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	532000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	4000	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	603000	USD
CY2009	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	8000	USD
CY2009	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-1919000	USD
CY2010	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-274000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-3574000	USD
CY2011Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	79233000	USD
CY2010Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	76637000	USD
CY2011Q4	us-gaap	Assets Assets	5204613000	USD
CY2010Q4	us-gaap	Assets Assets	5225083000	USD
CY2009Q4	us-gaap	Assets Assets	5359921000	USD
CY2010Q4	us-gaap	Assets Current AssetsCurrent	543880000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	462819000	USD
CY2010Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	156922000	USD
CY2011Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	168851000	USD
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CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	14641000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	140644000	USD
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CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	763000	USD
CY2010Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2010Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.50
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.50
CY2009	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.50
CY2011Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2010Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2010Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	86673174	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	79653624	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	7019550	shares
CY2010Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	86673174	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	79653624	shares
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	1193191000	USD
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	1290465000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	47311000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	178169000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-67824000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	11890000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	14047000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	13563000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	59729000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-53733000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	192744000	USD
CY2010Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	137622000	USD
CY2011Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	132420000	USD
CY2010Q4	us-gaap	Convertible Preferred Stock Nonredeemable Or Redeemable Issuer Option Value ConvertiblePreferredStockNonredeemableOrRedeemableIssuerOptionValue	100000000	USD
CY2011Q4	us-gaap	Convertible Preferred Stock Nonredeemable Or Redeemable Issuer Option Value ConvertiblePreferredStockNonredeemableOrRedeemableIssuerOptionValue	0	USD
CY2011Q3	us-gaap	Convertible Preferred Stock Shares Issued Upon Conversion ConvertiblePreferredStockSharesIssuedUponConversion	4778000	shares
CY2009	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	717989000	USD
CY2011	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	692922000	USD
CY2010	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	700727000	USD
CY2009	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	147949000	USD
CY2010	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	151704000	USD
CY2011	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	157047000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-52184000	USD
CY2009	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-81963000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1319000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-15528000	USD
CY2009	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-3770000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-4208000	USD
CY2011Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1678880000	USD
CY2011Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	50000000	USD
CY2009Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.069
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CY2011Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.066
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	28364000	USD
CY2009	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	112707000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	119280000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	27727000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	35674000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	124424000	USD
CY2011	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-225000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	9522000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7462000	USD
CY2009	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4393000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	0	USD
CY2010Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	46508000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	291141000	USD
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CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-669950000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-557309000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	9080000	USD
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CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	109875000	USD
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CY2011Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	9080000	USD
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CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	645099000	USD
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CY2010Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	164282000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	697528000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	579505000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	56312000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	53287000	USD
CY2011	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.04
CY2011Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	506605000	USD
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.18
CY2010Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.09
CY2010Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	453986000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	186067000	USD
CY2009	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	173446000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	195366000	USD
CY2010Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	15999000	USD
CY2011Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	3713000	USD
CY2011Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	0	USD
CY2010Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	5264000	USD
CY2011Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	0	USD
CY2010Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	3400000	USD
CY2010Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	8113000	USD
CY2011Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	1632000	USD
CY2010Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	31407000	USD
CY2010Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	12831000	USD
CY2011Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	2437000	USD
CY2010Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	2642000	USD
CY2011	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">New Accounting Pronouncements</font></div><div style="line-height:120%;padding-top:12px;text-align:justify;text-indent:41px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Information concerning recently issued accounting pronouncements that have not been adopted by the Company and could have a material impact, is presented below.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Accounting Standards Update 2011-04 - Fair Value Measurement: Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;text-align:justify;text-indent:42px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The FASB released amended guidance to provide a consistent definition of fair value and to ensure fair value measurement and disclosure requirements are similar between GAAP and International Financial Reporting Standards.  The update changes certain fair value measurement principles, further enhances disclosure requirements related to transfers between hierarchy levels, and increases qualitative disclosures regarding unobservable inputs used in Level 3 measurements, including the sensitivity of recurring Level 3 measurements to changes in significant unobservable inputs. In addition, the update requires disclosure of the level within the fair value hierarchy for fair value disclosures of instruments recorded on an amortized cost basis. The update is required to be applied prospectively and is effective for interim and annual reporting periods beginning on or after December 15, 2011, with early adoption prohibited. The Company does not believe this guidance will have a material impact on the Company's financial statements and will comply with this requirement upon its effective date. </font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Accounting Standards Update 2011-08 - Intangibles-Goodwill and Other: Testing Goodwill for Impairment</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;text-align:justify;text-indent:42px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The FASB released amended guidance that is intended to simplify requirements to test goodwill for impairment. Under the amended guidance, an entity will have the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less that its carrying amount. If an entity determines it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then performing the two-step impairment test will not be necessary. However, if an entity is unable to make this conclusion, then it will be required to perform the first step of the two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit, as required by current guidance. The update is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011, with early adoption permitted. The Company is currently evaluating the impacts of this new standard and will apply it in 2012.</font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;padding-bottom:13px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Accounting Standards Update 2011-11 - Balance Sheet: Disclosures about Offsetting Assets and Liabilities</font></div><div style="line-height:120%;text-align:justify;text-indent:42px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The FASB released amended guidance that will require entities to disclose both gross and net information about instruments and transactions eligible for offset in the statement of financial position as well as instruments and transactions subject to an agreement similar to a master netting arrangement. In addition, the update requires disclosure of collateral received and posted in connection with master netting agreements or similar agreements. The update is effective for annual reporting periods beginning on or after January 1, 2013, and interim periods therein. The disclosures required by this amendment will be applied retrospectively for all comparative periods presented. The Company is currently evaluating the impacts of this new standard.</font></div></div>
CY2010	us-gaap	Discontinued Operation Provision For Loss Gain On Disposal Before Income Tax DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax	0	USD
CY2009	us-gaap	Discontinued Operation Provision For Loss Gain On Disposal Before Income Tax DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax	-98425000	USD
CY2011	us-gaap	Discontinued Operation Provision For Loss Gain On Disposal Before Income Tax DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax	0	USD
CY2010	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2009	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	36687000	USD
CY2011	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2009	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45722000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	43652000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45726000	USD
CY2010Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	11565000	USD
CY2011Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	10089000	USD
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.49
CY2009	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.36
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.98
CY2010Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.36
CY2010Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.09
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.18
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2010Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2010Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.18
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.04
CY2009	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.36
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.49
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.96
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.35
CY2010Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.53
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.04
CY2010Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2010Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.18
CY2009	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3041
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.5089
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.389
CY2010	us-gaap	Electric Production Expense ElectricProductionExpense	195919000	USD
CY2011	us-gaap	Electric Production Expense ElectricProductionExpense	180850000	USD
CY2009	us-gaap	Electric Production Expense ElectricProductionExpense	185228000	USD
CY2010	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	1673517000	USD
CY2009	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	1647744000	USD
CY2011	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	1700619000	USD
CY2011Q4	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	347872000	USD
CY2011Q2	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	415586000	USD
CY2011Q3	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	549498000	USD
CY2010Q4	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	380651000	USD
CY2010Q2	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	405817000	USD
CY2010Q1	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	383396000	USD
CY2011Q1	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	387663000	USD
CY2010Q3	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	503653000	USD
CY2011Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	2300000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition	1900.0	years
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	580000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	760000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0	USD
CY2011	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
CY2010	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	188176000	USD
CY2009	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	176359000	USD
CY2009	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	53515000	USD
CY2010	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-45215000	USD
CY2011	us-gaap	Fair Value Level1 To Level2 Transfers Amount FairValueLevel1ToLevel2TransfersAmount	0	USD
CY2011	us-gaap	Fair Value Level2 To Level1 Transfers Amount FairValueLevel2ToLevel1TransfersAmount	0	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	3163000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	70000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	1783000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	0	USD
CY2010Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5414000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	0	USD
CY2011	us-gaap	Gain Loss On Investments GainLossOnInvestments	8985000	USD
CY2009	us-gaap	Gain Loss On Investments GainLossOnInvestments	4502000	USD
CY2010	us-gaap	Gain Loss On Investments GainLossOnInvestments	4868000	USD
CY2010	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	4868000	USD
CY2011	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	8985000	USD
CY2009	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	4502000	USD
CY2010	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-9209000	USD
CY2009	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	7317000	USD
CY2011Q4	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	9200000	USD
CY2009	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	262282000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	264556000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	257774000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	321310000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	278297000	USD
CY2009Q4	us-gaap	Goodwill Goodwill	321310000	USD
CY2011	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2010	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2010	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
CY2011	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
CY2010	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	13563000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	14047000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	11890000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	94751000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-63379000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	312469000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	190934000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-31124000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	65933000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.58
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.49
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.98
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.96
CY2009	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.58
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.49
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	70801000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.78
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.78
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-15223000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2009	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-30145000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	121535000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28818000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-32255000	USD
CY2011	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	121535000	USD
CY2009	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	28818000	USD
CY2010	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	-32255000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-22183000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	33163000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	109364000	USD
CY2010	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	4747000	USD
CY2011	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	4917000	USD
CY2009	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	4162000	USD
CY2009	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	3777000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	3659000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation And Amortization IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization	3995000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2703000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1755000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-579000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3395000	USD
CY2009	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	344000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-6312000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2549000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2318000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2429000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	118160000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-5527000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-99318000	USD
CY2011Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	95130000	USD
CY2010Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	97450000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-70540000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	20969000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-15462000	USD
CY2011	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-112641000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2200000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1848000	USD
CY2009	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1083000	USD
CY2011	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	21979000	USD
CY2009	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-47559000	USD
CY2010	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	42841000	USD
CY2009	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-20980000	USD
CY2011	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	3460000	USD
CY2010	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-35974000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-8559000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-725000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	15835000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-36750000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-6735000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-14195000	USD
CY2009	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	236000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	556000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2010Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	26425000	USD
CY2011Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	0	USD
CY2010	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	800000	USD
CY2009	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	700000	USD
CY2011	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	500000	USD
CY2009	us-gaap	Interest Expense InterestExpense	122205000	USD
CY2011	us-gaap	Interest Expense InterestExpense	124849000	USD
CY2010	us-gaap	Interest Expense InterestExpense	125373000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	116391000	USD
CY2009	us-gaap	Interest Paid Net InterestPaidNet	118798000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	119676000	USD
CY2010Q4	us-gaap	Inventory Net InventoryNet	52479000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	54231000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	18896000	USD
CY2009	us-gaap	Investment Income Interest InvestmentIncomeInterest	28389000	USD
CY2011	us-gaap	Investment Income Interest InvestmentIncomeInterest	15515000	USD
CY2009	us-gaap	Investment Tax Credit InvestmentTaxCredit	-2549000	USD
CY2010	us-gaap	Investment Tax Credit InvestmentTaxCredit	-2429000	USD
CY2011	us-gaap	Investment Tax Credit InvestmentTaxCredit	-2318000	USD
CY2011Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	11100000	USD
CY2010Q4	us-gaap	Liabilities Liabilities	3491635000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	3536676000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5225083000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5204613000	USD
CY2010Q4	us-gaap	Liabilities Current LiabilitiesCurrent	520124000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	373268000	USD
CY2010Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	1407916000	USD
CY2011Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	1491782000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	300000000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	584900000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	1674013000	USD
CY2010Q4	us-gaap	Long Term Debt LongTermDebt	1565847000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	2387000	USD
CY2010Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	2252000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1442070000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	2387000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	181892000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	50000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	2531000	USD
CY2010Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1563595000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1671626000	USD
CY2011Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	1800000	USD
CY2010Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	32000000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	82423000	USD
CY2010Q4	us-gaap	Minority Interest MinorityInterest	85177000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-10683000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-593435000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-312331000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	19778000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	379726000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-275906000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	287352000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	292240000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	87706000	USD
CY2009	us-gaap	Net Income Loss NetIncomeLoss	124316000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	-45215000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	176359000	USD
CY2010Q4	us-gaap	Net Income Loss NetIncomeLoss	-108196000	USD
CY2010Q1	us-gaap	Net Income Loss NetIncomeLoss	-8449000	USD
CY2010Q3	us-gaap	Net Income Loss NetIncomeLoss	48552000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	16637000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	43662000	USD
CY2010Q2	us-gaap	Net Income Loss NetIncomeLoss	22878000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	4067000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	111993000	USD
CY2009	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	11890000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	14047000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	13563000	USD
CY2010Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	72901000	USD
CY2011Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	80067000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	257299000	USD
CY2009	us-gaap	Operating Income Loss OperatingIncomeLoss	191942000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	239452000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	63935000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	52220000	USD
CY2010Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	73674000	USD
CY2010Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	49888000	USD
CY2010Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	10482000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	32860000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	108284000	USD
CY2010Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	105408000	USD
CY2010Q4	us-gaap	Other Assets Current OtherAssetsCurrent	96110000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	33397000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	7065000	USD
CY2009	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	9473000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-653000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	1810000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-77005000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-22609000	USD
CY2011	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Net Of Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax	-822000	USD
CY2009	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Net Of Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax	66448000	USD
CY2010	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Net Of Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax	7813000	USD
CY2011	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax	512000	USD
CY2010	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax	-5114000	USD
CY2009	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax	-43542000	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	2348000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	21295000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	4684000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	3070000	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	1538000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	13956000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-2218000	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	29068000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	27313000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	18120000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	-1230000	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	20421000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	7471000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	4839000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-349000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	20718000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	10136000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	11386000	USD
CY2011	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2009	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	129833000	USD
CY2011	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	149185000	USD
CY2010	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	85847000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	13577000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	6643000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	7462000	USD
CY2011Q4	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	106378000	USD
CY2010Q4	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	147616000	USD
CY2010	us-gaap	Other Expenses OtherExpenses	12660000	USD
CY2011	us-gaap	Other Expenses OtherExpenses	24715000	USD
CY2009	us-gaap	Other Expenses OtherExpenses	9361000	USD
CY2011	us-gaap	Other Income OtherIncome	5309000	USD
CY2009	us-gaap	Other Income OtherIncome	31629000	USD
CY2010	us-gaap	Other Income OtherIncome	14837000	USD
CY2010Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	109148000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	111127000	USD
CY2011Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	12207000	USD
CY2010Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	18791000	USD
CY2010	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	1719000	USD
CY2009	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	7096000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	939000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	180019000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-177458000	USD
CY2009	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	25014000	USD
CY2010Q4	us-gaap	Other Receivables OtherReceivables	60562000	USD
CY2011Q4	us-gaap	Other Receivables OtherReceivables	71069000	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-4697000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2004000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	17000	USD
CY2009	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	125683000	USD
CY2011Q4	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	125700000	USD
CY2011Q4	us-gaap	Payments For Repurchase Of Convertible Preferred Stock PaymentsForRepurchaseOfConvertiblePreferredStock	73500000	USD
CY2011	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	73475000	USD
CY2009	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	0	USD
CY2010	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	0	USD
CY2011	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	16801000	USD
CY2010	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	17745000	USD
CY2009	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	13639000	USD
CY2010	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	46254000	USD
CY2009	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	46229000	USD
CY2011	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	45656000	USD
CY2011	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	10104000	USD
CY2010	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2986000	USD
CY2009	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	951000	USD
CY2010	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	20279000	USD
CY2009	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2011	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	326931000	USD
CY2009	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	288031000	USD
CY2010	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	281488000	USD
CY2010Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	270172000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	224766000	USD
CY2010	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	528000	USD
CY2009	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	528000	USD
CY2011	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	528000	USD
CY2011Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	477800	shares
CY2011Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	100000000	USD
CY2010	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2011	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	-174925000	USD
CY2009	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2009	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1245000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	210000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	403845000	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	345242000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-139300000	USD
CY2010	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	24000000	USD
CY2009	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-546667000	USD
CY2010	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	79853000	USD
CY2009	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	124054000	USD
CY2011	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	145286000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1247000	USD
CY2009	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	5622000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	-31124000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	190934000	USD
CY2009	us-gaap	Profit Loss ProfitLoss	136734000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	7669000	USD
CY2010Q1	us-gaap	Profit Loss ProfitLoss	-5214000	USD
CY2010Q4	us-gaap	Profit Loss ProfitLoss	-104805000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	19952000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	47905000	USD
CY2010Q3	us-gaap	Profit Loss ProfitLoss	52593000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	115408000	USD
CY2010Q2	us-gaap	Profit Loss ProfitLoss	26302000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	2307000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	120000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	7333000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	4631000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1626693000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1705520000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	3444444000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	3627134000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	5120167000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	4860614000	USD
CY2011Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	44993000	USD
CY2010Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	36292000	USD
CY2010Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	502467000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	482155000	USD
CY2010Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	342465000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	418098000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	110752000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	405970000	USD
CY2009	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	352084000	USD
CY2011Q4	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	58500000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	447650000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	314943000	USD
CY2009	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2010	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2011	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	430000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2009	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	1647744000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	13514000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	6633000	USD
CY2010	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	1673517000	USD
CY2011	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	1700619000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	6556000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	2894000	USD
CY2009	us-gaap	Share Based Compensation ShareBasedCompensation	2188000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0409
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0627
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	4.5	years
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	4.6	years
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.4155
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.4203
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0213
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0156
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3240000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2738362	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	22.16
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm	4.29	years
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	15000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	525000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	2616000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	8.69
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	11.39
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	10.22
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	166516	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	239444	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	696513	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	21.26
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	24.71
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	21.32
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	106966	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	69200	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	12999	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	16.40
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	11.46
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	11.02
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	790064	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	618708	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	8.23
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	12.23
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	1.63
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.05
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.00
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	1610851	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3948262	shares
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3725907	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4274019	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3202229	shares
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	21.54
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	18.95
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	18.33
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	19.19
CY2011Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	1146714	USD
CY2011Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1	4.80	years
CY2011Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	82700000	USD
CY2010Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	222000000	USD
CY2011Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0205
CY2009	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	93328	shares
CY2009	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	48202	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	140986	shares
CY2009	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	6236	shares
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	493590	shares
CY2009	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1245000	USD
CY2011	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	125838000	USD
CY2010	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	2986000	USD
CY2009	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	951000	USD
CY2011	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	10104000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1573985000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	1536742000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1656408000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1721919000	USD
CY2008Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1844912000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1839076000	USD
CY2011Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	57401000	USD
CY2010Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	71453000	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	8713000	USD
CY2010	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-29303000	USD
CY2009	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	9570000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	36105000	USD
CY2008Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	16388000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22591000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	19580000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	15735000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	-790000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	6418000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	467000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	397000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-16555000	USD
CY2011Q4	us-gaap	Unsecured Long Term Debt UnsecuredLongTermDebt	50000000	USD
CY2010	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	1434065000	USD
CY2009	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	1455802000	USD
CY2011	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	1443320000	USD
CY2011	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	63632000	USD
CY2010	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	57738000	USD
CY2009	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	51501000	USD
CY2008Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	21466000	USD
CY2009Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	12783000	USD
CY2010Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	11178000	USD
CY2011Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	1778000	USD
CY2009	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	43937000	USD
CY2011	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	24116000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	27566000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	0	USD
CY2011	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	0	USD
CY2009	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	0	USD
CY2011	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	33516000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	29171000	USD
CY2009	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	52620000	USD
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	89757000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	91557000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	91671000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	85558000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	86634000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	86673000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	91557000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	91435000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	89201000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	23000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	174000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	106000	shares
CY2010	pnm	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liabilities Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilitiesSettlements	-506000	USD
CY2009	pnm	Gain On Sale Of Business Segment GainOnSaleOfBusinessSegment	0	USD
CY2010	pnm	Gain On Sale Of Business Segment GainOnSaleOfBusinessSegment	0	USD
CY2011	pnm	Gain On Sale Of Business Segment GainOnSaleOfBusinessSegment	174925000	USD
CY2009	pnm	Gross Margin GrossMargin	929755000	USD
CY2009Q4	pnm	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityValue	248000	USD
CY2011	pnm	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liabilities Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilitiesSettlements	1578000	USD
CY2011Q4	pnm	Accounts Payable Payments For Utility And Non Utility Plant Additions AccountsPayablePaymentsForUtilityAndNonUtilityPlantAdditions	33655000	USD
CY2011Q4	pnm	Accrued Interest And Taxes Payable AccruedInterestAndTaxesPayable	53114000	USD
CY2010Q4	pnm	Accrued Interest And Taxes Payable AccruedInterestAndTaxesPayable	47783000	USD
CY2010Q4	pnm	Accumulated Amortization Nuclear Fuel AccumulatedAmortizationNuclearFuel	26247000	USD
CY2011Q4	pnm	Accumulated Amortization Nuclear Fuel AccumulatedAmortizationNuclearFuel	36411000	USD
CY2011Q4	pnm	Budgeted Future Construction Expenditures Year Five BudgetedFutureConstructionExpendituresYearFive	223000000	USD
CY2011Q4	pnm	Budgeted Future Construction Expenditures Year Four BudgetedFutureConstructionExpendituresYearFour	255800000	USD
CY2011Q4	pnm	Budgeted Future Construction Expenditures Year One BudgetedFutureConstructionExpendituresYearOne	286600000	USD
CY2011Q4	pnm	Budgeted Future Construction Expenditures Year Three BudgetedFutureConstructionExpendituresYearThree	275500000	USD
CY2011Q4	pnm	Budgeted Future Construction Expenditures Year Two BudgetedFutureConstructionExpendituresYearTwo	266000000	USD
CY2005Q2	pnm	Business Acquisition Purchase Price Allocation Intangible Assets BusinessAcquisitionPurchasePriceAllocationIntangibleAssets	79300000	USD
CY2011	pnm	Change In Tax Effects Of Income Tax Related Regulatory Assets And Liabilities ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities	-29427000	USD
CY2011Q4	pnm	Common Stock Repurchase Discount CommonStockRepurchaseDiscount	0.02
CY2010Q4	pnm	Convertible Preferred Stock Without Mandatory Redemption Requirements Par Value ConvertiblePreferredStockWithoutMandatoryRedemptionRequirementsParValue	0
CY2011Q4	pnm	Convertible Preferred Stock Without Mandatory Redemption Requirements Par Value ConvertiblePreferredStockWithoutMandatoryRedemptionRequirementsParValue	0
CY2010Q4	pnm	Convertible Preferred Stock Without Mandatory Redemption Requirements Shares Authorized ConvertiblePreferredStockWithoutMandatoryRedemptionRequirementsSharesAuthorized	10000000	shares
CY2011Q4	pnm	Convertible Preferred Stock Without Mandatory Redemption Requirements Shares Authorized ConvertiblePreferredStockWithoutMandatoryRedemptionRequirementsSharesAuthorized	10000000	shares
CY2011Q4	pnm	Convertible Preferred Stock Without Mandatory Redemption Requirements Shares Issued ConvertiblePreferredStockWithoutMandatoryRedemptionRequirementsSharesIssued	0	shares
CY2010Q4	pnm	Convertible Preferred Stock Without Mandatory Redemption Requirements Shares Issued ConvertiblePreferredStockWithoutMandatoryRedemptionRequirementsSharesIssued	477800	shares
CY2010Q4	pnm	Convertible Preferred Stock Without Mandatory Redemption Requirements Shares Outstanding ConvertiblePreferredStockWithoutMandatoryRedemptionRequirementsSharesOutstanding	477800	shares
CY2011Q4	pnm	Convertible Preferred Stock Without Mandatory Redemption Requirements Shares Outstanding ConvertiblePreferredStockWithoutMandatoryRedemptionRequirementsSharesOutstanding	0	shares
CY2009Q1	pnm	Cost Of Gas Recovery Percent CostOfGasRecoveryPercent	1
CY2010Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirements	11529000	USD
CY2011Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirements	11529000	USD
CY2010Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Par Or Stated Value Per Share CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsParOrStatedValuePerShare	100
CY2011Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Par Or Stated Value Per Share CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsParOrStatedValuePerShare	100
CY2010Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Authorized CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesAuthorized	10000000	shares
CY2011Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Authorized CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesAuthorized	10000000	shares
CY2010Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Issued CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesIssued	115293	shares
CY2011Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Issued CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesIssued	115293	shares
CY2010Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Outstanding CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesOutstanding	115293	shares
CY2011Q4	pnm	Cumulative Preferred Stock Of Subsidiary Without Mandatory Redemption Requirements Shares Outstanding CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesOutstanding	115293	shares
CY2011Q4	pnm	Debt Instrument Repurchase Premium DebtInstrumentRepurchasePremium	0.17
CY2011Q4	pnm	Deferred Tax Liabilities Investment Tax Credit DeferredTaxLiabilitiesInvestmentTaxCredit	15771000	USD
CY2010Q4	pnm	Deferred Tax Liabilities Investment Tax Credit DeferredTaxLiabilitiesInvestmentTaxCredit	18089000	USD
CY2011Q4	pnm	Deferred Tax Liabilities Stranded Costs DeferredTaxLiabilitiesStrandedCosts	28439000	USD
CY2010Q4	pnm	Deferred Tax Liabilities Stranded Costs DeferredTaxLiabilitiesStrandedCosts	33287000	USD
CY2011	pnm	Defined Benefit Plan Election Of Relieving Losses In Asset Market Value Period DefinedBenefitPlanElectionOfRelievingLossesInAssetMarketValuePeriod	2
CY2011	pnm	Defined Benefit Plans Gains And Losses That Lie Outside Corridor Amortized In Years DefinedBenefitPlansGainsAndLossesThatLieOutsideCorridorAmortizedInYears	P5Y
CY2011	pnm	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2011	pnm	Defined Contribution Plan Maximum Annual Contribution Per Employee Percent DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent	0.75
CY2009Q2	pnm	Employee Stock Purchase Plan Purchase Shares Of Common Stock At Discount Of Market Price Discount Terminated EmployeeStockPurchasePlanPurchaseSharesOfCommonStockAtDiscountOfMarketPriceDiscountTerminated	0.05
CY2010	pnm	Fair Value Assets And Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss Included In Earnings FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings	-1087000	USD
CY2011	pnm	Fair Value Assets And Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss Included In Earnings FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings	0	USD
CY2010Q4	pnm	Fair Value Disclosure Derivative Reconciling Amount From Contract Value To Fair Value FairValueDisclosureDerivativeReconcilingAmountFromContractValueToFairValue	100000	USD
CY2010	pnm	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInEarnings	-1646000	USD
CY2011	pnm	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInEarnings	1020000	USD
CY2011	pnm	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityTransfersIntoLevel3	0	USD
CY2011	pnm	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityTransfersOutOfLevel3	0	USD
CY2011Q4	pnm	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityValue	0	USD
CY2010Q4	pnm	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityValue	-822000	USD
CY2010	pnm	Gross Margin GrossMargin	972790000	USD
CY2011	pnm	Gross Margin GrossMargin	1007697000	USD
CY2010	pnm	Income Loss From Equity Method Investments Including Other Than Temporary Impairment IncomeLossFromEquityMethodInvestmentsIncludingOtherThanTemporaryImpairment	-203399000	USD
CY2011	pnm	Income Tax Reconciliation Goodwill IncomeTaxReconciliationGoodwill	15055000	USD
CY2011	pnm	Increase Decrease In Accounts Receivable And Unbilled Revenues IncreaseDecreaseInAccountsReceivableAndUnbilledRevenues	70734000	USD
CY2009	pnm	Increase Decrease In Accounts Receivable And Unbilled Revenues IncreaseDecreaseInAccountsReceivableAndUnbilledRevenues	48809000	USD
CY2010	pnm	Increase Decrease In Accounts Receivable And Unbilled Revenues IncreaseDecreaseInAccountsReceivableAndUnbilledRevenues	11398000	USD
CY2009	pnm	Increase Decrease In Accrued Interest And Taxes IncreaseDecreaseInAccruedInterestAndTaxes	-94996000	USD
CY2010	pnm	Increase Decrease In Accrued Interest And Taxes IncreaseDecreaseInAccruedInterestAndTaxes	34163000	USD
CY2011	pnm	Increase Decrease In Accrued Interest And Taxes IncreaseDecreaseInAccruedInterestAndTaxes	7304000	USD
CY2009	pnm	Incremental Common Shares Attributable To Conversion Of Preferred Stock Basic IncrementalCommonSharesAttributableToConversionOfPreferredStockBasic	4778000	shares
CY2011	pnm	Incremental Common Shares Attributable To Conversion Of Preferred Stock Basic IncrementalCommonSharesAttributableToConversionOfPreferredStockBasic	3469000	shares
CY2010	pnm	Incremental Common Shares Attributable To Conversion Of Preferred Stock Basic IncrementalCommonSharesAttributableToConversionOfPreferredStockBasic	4778000	shares
CY2011Q4	pnm	Invested Cash And Cash Equivalents InvestedCashAndCashEquivalents	600000	USD
CY2010Q4	pnm	Investment In Pvngs Lessor Notes InvestmentInPvngsLessorNotes	103871000	USD
CY2011Q4	pnm	Investment In Pvngs Lessor Notes InvestmentInPvngsLessorNotes	79049000	USD
CY2011Q4	pnm	Line Of Credit Facility Amount Outstanding Local Institutions LineOfCreditFacilityAmountOutstandingLocalInstitutions	5000000	USD
CY2011Q4	pnm	Line Of Credit Facility And Local Lines Of Credit Remaining Borrowing Capacity LineOfCreditFacilityAndLocalLinesOfCreditRemainingBorrowingCapacity	266200000	USD
CY2011Q4	pnm	Line Of Credit Facility Extension Option Years LineOfCreditFacilityExtensionOptionYears	P1Y
CY2011Q4	pnm	Line Of Credit Facility Original Maximum Borrowing Capacity LineOfCreditFacilityOriginalMaximumBorrowingCapacity	600000000	USD
CY2011Q4	pnm	Line Of Credit Facility Reduction Of Borrowing Capacity LineOfCreditFacilityReductionOfBorrowingCapacity	517000000	USD
CY2011Q4	pnm	Minimum Megawatt Capacity From Coal And Oil Fired Electric Generating Units Under Jurisdiction Of Merucy And Air Toxics Standards MinimumMegawattCapacityFromCoalAndOilFiredElectricGeneratingUnitsUnderJurisdictionOfMerucyAndAirToxicsStandards	25
CY2009	pnm	Net Income Loss Attributable To Parent Excluding Discontinued Operations NetIncomeLossAttributableToParentExcludingDiscontinuedOperations	53515000	USD
CY2009	pnm	Net Income Loss Including Portion Attributable To Noncontrolling Interest Excluding Discontinued Operations NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestExcludingDiscontinuedOperations	65933000	USD
CY2009	pnm	Non Controlling Interest Transactions With Its Owner NonControllingInterestTransactionsWithItsOwner	-21037000	USD
CY2010	pnm	Non Controlling Interest Transactions With Its Owner NonControllingInterestTransactionsWithItsOwner	-17745000	USD
CY2011	pnm	Non Controlling Interest Transactions With Its Owner NonControllingInterestTransactionsWithItsOwner	-16801000	USD
CY2011	pnm	Operating Lease Extended Term OperatingLeaseExtendedTerm	P6Y
CY2011	pnm	Operating Leases Renewal Options After Original Lease Term OperatingLeasesRenewalOptionsAfterOriginalLeaseTerm	P2Y
CY2011Q4	pnm	Other Deferred Costs Net Including Deferred Finance Costs OtherDeferredCostsNetIncludingDeferredFinanceCosts	89470000	USD
CY2010Q4	pnm	Other Deferred Costs Net Including Deferred Finance Costs OtherDeferredCostsNetIncludingDeferredFinanceCosts	94376000	USD
CY2009	pnm	Other Income Deductions Excluding Interest OtherIncomeDeductionsExcludingInterest	26770000	USD
CY2010	pnm	Other Income Deductions Excluding Interest OtherIncomeDeductionsExcludingInterest	7045000	USD
CY2011	pnm	Other Income Deductions Excluding Interest OtherIncomeDeductionsExcludingInterest	-10421000	USD
CY2009	pnm	Other Operating Expenses OtherOperatingExpenses	589864000	USD
CY2010	pnm	Other Operating Expenses OtherOperatingExpenses	581634000	USD
CY2011	pnm	Other Operating Expenses OtherOperatingExpenses	593351000	USD
CY2010	pnm	Payments Of Debt Issuance Costs And Other PaymentsOfDebtIssuanceCostsAndOther	5231000	USD
CY2011	pnm	Payments Of Debt Issuance Costs And Other PaymentsOfDebtIssuanceCostsAndOther	5349000	USD
CY2009	pnm	Payments Of Debt Issuance Costs And Other PaymentsOfDebtIssuanceCostsAndOther	10329000	USD
CY2010	pnm	Payments Received On Pvngs Firm Sales Contracts PaymentsReceivedOnPvngsFirmSalesContracts	30476000	USD
CY2009	pnm	Payments Received On Pvngs Firm Sales Contracts PaymentsReceivedOnPvngsFirmSalesContracts	30737000	USD
CY2011	pnm	Payments Received On Pvngs Firm Sales Contracts PaymentsReceivedOnPvngsFirmSalesContracts	2558000	USD
CY2009	pnm	Payments To Acquire Productive Assets Excludes Gross Property Additions Related To Discontinued Operations And Includes Purchase Of Acquired Lease Assets PaymentsToAcquireProductiveAssetsExcludesGrossPropertyAdditionsRelatedToDiscontinuedOperationsAndIncludesPurchaseOfAcquiredLeaseAssets	284597000	USD
CY2009Q1	pnm	Pension And Other Postretirement Defined Benefit Plans Liability Transfer Resulting From Sale PensionAndOtherPostretirementDefinedBenefitPlansLiabilityTransferResultingFromSale	15700000	USD
CY2011	pnm	Preferred Stock Dividend Requirements Of Subsidiary PreferredStockDividendRequirementsOfSubsidiary	-528000	USD
CY2009	pnm	Preferred Stock Dividend Requirements Of Subsidiary PreferredStockDividendRequirementsOfSubsidiary	-528000	USD
CY2010	pnm	Preferred Stock Dividend Requirements Of Subsidiary PreferredStockDividendRequirementsOfSubsidiary	-528000	USD
CY2011Q3	pnm	Preferred Stock Purchase Discount PreferredStockPurchaseDiscount	0.02
CY2009	pnm	Proceeds From Governmental Grants ProceedsFromGovernmentalGrants	0	USD
CY2010	pnm	Proceeds From Governmental Grants ProceedsFromGovernmentalGrants	0	USD
CY2011	pnm	Proceeds From Governmental Grants ProceedsFromGovernmentalGrants	2103000	USD
CY2009	pnm	Proceeds From Transmission Interconnection Arrangements ProceedsFromTransmissionInterconnectionArrangements	0	USD
CY2011	pnm	Proceeds From Transmission Interconnection Arrangements ProceedsFromTransmissionInterconnectionArrangements	1246000	USD
CY2010	pnm	Proceeds From Transmission Interconnection Arrangements ProceedsFromTransmissionInterconnectionArrangements	8515000	USD
CY2010Q4	pnm	Public Utilities Property Plant And Equipment In Service Net PublicUtilitiesPropertyPlantAndEquipmentInServiceNet	3233921000	USD
CY2011Q4	pnm	Public Utilities Property Plant And Equipment In Service Net PublicUtilitiesPropertyPlantAndEquipmentInServiceNet	3414647000	USD
CY2010	pnm	Pvngs Firm Sales Contract Revenue PvngsFirmSalesContractRevenue	-58289000	USD
CY2011	pnm	Pvngs Firm Sales Contract Revenue PvngsFirmSalesContractRevenue	-2558000	USD
CY2009	pnm	Pvngs Firm Sales Contract Revenue PvngsFirmSalesContractRevenue	-56887000	USD
CY2011Q4	pnm	Ratio Of Debt To Capital Maximum RatioOfDebtToCapitalMaximum	0.65
CY2010	pnm	Regulatory Disallowance RegulatoryDisallowance	0	USD
CY2011	pnm	Regulatory Disallowance RegulatoryDisallowance	21402000	USD
CY2009	pnm	Regulatory Disallowance RegulatoryDisallowance	27542000	USD
CY2011Q4	pnm	Regulatory Liabilities Related To Income Taxes RegulatoryLiabilitiesRelatedToIncomeTaxes	49413000	USD
CY2010Q4	pnm	Regulatory Liabilities Related To Income Taxes RegulatoryLiabilitiesRelatedToIncomeTaxes	17037000	USD
CY2011	pnm	Repayment Of Transmission Interconnection Agreements RepaymentOfTransmissionInterconnectionAgreements	4637000	USD
CY2009	pnm	Repayment Of Transmission Interconnection Agreements RepaymentOfTransmissionInterconnectionAgreements	0	USD
CY2010	pnm	Repayment Of Transmission Interconnection Agreements RepaymentOfTransmissionInterconnectionAgreements	0	USD
CY2009	pnm	Return Of Principal On Pvngs Lessor Notes ReturnOfPrincipalOnPvngsLessorNotes	27068000	USD
CY2011	pnm	Return Of Principal On Pvngs Lessor Notes ReturnOfPrincipalOnPvngsLessorNotes	32274000	USD
CY2010	pnm	Return Of Principal On Pvngs Lessor Notes ReturnOfPrincipalOnPvngsLessorNotes	29851000	USD
CY2010	pnm	Settlement Of Legal Proceeding SettlementOfLegalProceeding	0	USD
CY2009	pnm	Settlement Of Legal Proceeding SettlementOfLegalProceeding	31969000	USD
CY2011	pnm	Settlement Of Legal Proceeding SettlementOfLegalProceeding	0	USD
CY2011Q4	pnm	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Shares Above Entities Stock Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingSharesAboveEntitiesStockPrice	1591648000	shares
CY2010	pnm	Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue	1393000	USD
CY2011	pnm	Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue	1189000	USD
CY2009	pnm	Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue	1179000	USD
CY2011	pnm	Stock Repurchased Andissued During Period Value Conversion And Repurchase Of Preferred Stock Net StockRepurchasedAndissuedDuringPeriodValueConversionAndRepurchaseOfPreferredStockNet	73510000	USD
CY2011	pnm	Tax Effect Of Excess Pension Liability TaxEffectOfExcessPensionLiability	-508000	USD
CY2011	pnm	Tax Effect Of Mark To Market Adjustments TaxEffectOfMarkToMarketAdjustments	-356000	USD
CY2011Q4	pnm	Total Budgeted Construction Expenditures TotalBudgetedConstructionExpenditures	1306900000	USD
CY2010Q4	pnm	Total Deferred Charges And Other Assets TotalDeferredChargesAndOtherAssets	949842000	USD
CY2011Q4	pnm	Total Deferred Charges And Other Assets TotalDeferredChargesAndOtherAssets	849922000	USD
CY2011Q4	pnm	Total Other Property And Investments TotalOtherPropertyAndInvestments	264738000	USD
CY2010Q4	pnm	Total Other Property And Investments TotalOtherPropertyAndInvestments	286917000	USD
CY2011	pnm	Transmission And Distribution Costs TransmissionAndDistributionCosts	69693000	USD
CY2010	pnm	Transmission And Distribution Costs TransmissionAndDistributionCosts	63421000	USD
CY2009	pnm	Transmission And Distribution Costs TransmissionAndDistributionCosts	63311000	USD
CY2011	dei	Amendment Flag AmendmentFlag	false
CY2011	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2011	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2011	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2011
CY2011	dei	Document Period End Date DocumentPeriodEndDate	2011-12-31
CY2011	dei	Document Type DocumentType	10-K
CY2011	dei	Entity Central Index Key EntityCentralIndexKey	0001108426
CY2012Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	79653624	shares
CY2011	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2011	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2011Q2	dei	Entity Public Float EntityPublicFloat	1450908933	USD
CY2011	dei	Entity Registrant Name EntityRegistrantName	PNM RESOURCES INC
CY2011	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2011	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0001108426-12-000014-index-headers.html	Edgar Link	pending
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0001108426-12-000014.txt	Edgar Link	pending
0001108426-12-000014-xbrl.zip	Edgar Link	pending
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pnm-20111231.xml	Edgar Link	completed
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$TXNM
TXNM ENERGY INC Stock $txnm

2011 Q4 Form 10-K Financial Statement

#000110842612000014 Filed on February 29, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TXNM TXNM ENERGY INC Stock $txnm

2011 Q4 Form 10-K Financial Statement

#000110842612000014 Filed on February 29, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TXNM
TXNM ENERGY INC Stock $txnm