$ARCH
ARCH RESOURCES, INC. Stock $arch

$arch Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-K Financial Statement

#000104746913002059 Filed on March 01, 2013

Income Statement

Concept	2012 Q4	2011 Q4	2011 Q3
Revenue	$867.0M	$1.229B	$1.199B
YoY Change	-29.44%	47.09%	37.04%
Cost Of Revenue	$740.8M	$945.8M	$952.9M
YoY Change	-21.67%	51.98%	46.17%
Gross Profit	$12.52M	$154.4M	$120.1M
YoY Change	-91.89%	-27.52%	-46.13%
Gross Profit Margin	1.44%	12.56%	10.02%
Selling, General & Admin	$35.00M	$26.30M	$33.28M
YoY Change	33.08%	-8.36%	23.24%
% of Gross Profit	279.64%	17.04%	27.71%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$125.8M	$146.3M	$139.5M
YoY Change	-14.01%	52.4%	50.37%
% of Gross Profit	1005.11%	94.76%	116.21%
Operating Expenses	$254.7M	$155.9M	$1.122B
YoY Change	63.37%	20.29%	815.51%
Operating Profit	-$307.2M	$139.7M	$76.26M
YoY Change	-319.83%	67.54%	-23.97%
Interest Expense	-$55.70M	-$62.60M	$77.69M
YoY Change	-11.02%	103.91%	-301.28%
% of Operating Profit		-44.8%	101.89%
Other Income/Expense, Net		$0.00	-$1.708M
YoY Change
Pretax Income	-$398.3M	$63.20M	-$2.306M
YoY Change	-730.22%	19.47%	-104.21%
Income Tax	-$91.30M	-$6.800M	-$11.43M
% Of Pretax Income		-10.76%
Net Earnings	-$295.4M	$71.22M	$8.890M
YoY Change	-514.83%	47.75%	-80.96%
Net Earnings / Revenue	-34.07%	5.8%	0.74%
Basic Earnings Per Share	-$1.39	$0.34	$0.04
Diluted Earnings Per Share	-$1.39	$0.33	$0.04
COMMON SHARES
Basic Shares Outstanding	212.2M shares		211.3M shares
Diluted Shares Outstanding			212.0M shares

Balance Sheet

Concept	2012 Q4	2011 Q4	2011 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.019B	$138.1M	$159.0M
YoY Change	637.56%	46.97%	148.44%
Cash & Equivalents	$784.6M	$138.1M	$158.5M
Short-Term Investments	$234.3M
Other Short-Term Assets	$92.47M	$110.3M	$176.0M
YoY Change	-16.17%	-27.91%	-5.38%
Inventory	$365.4M	$377.5M	$346.0M
Prepaid Expenses
Receivables	$247.5M	$380.6M	$343.0M
Other Receivables	$84.00M	$88.00M	$83.00M
Total Short-Term Assets	$1.914B	$1.183B	$1.108B
YoY Change	61.83%	60.92%	45.22%
LONG-TERM ASSETS
Property, Plant & Equipment	$7.337B	$7.949B	$7.703B
YoY Change	-7.7%	140.23%	133.21%
Goodwill	$265.4M	$596.1M
YoY Change	-55.47%	418.52%
Intangibles
YoY Change
Long-Term Investments	$242.2M	$225.6M	$225.0M
YoY Change	7.36%	27.14%	51.01%
Other Assets	$160.2M	$173.7M	$280.0M
YoY Change	-7.79%	-68.13%	-44.66%
Total Long-Term Assets	$755.6M	$1.082B	$8.854B
YoY Change	-30.17%	-73.9%	117.43%
TOTAL ASSETS
Total Short-Term Assets	$1.914B	$1.183B	$1.108B
Total Long-Term Assets	$755.6M	$1.082B	$8.854B
Total Assets	$10.01B	$10.21B	$9.962B
YoY Change	-2.03%	109.27%	106.03%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$224.4M	$383.8M	$293.0M
YoY Change	-41.52%	93.83%	70.35%
Accrued Expenses	$318.0M	$348.2M	$380.0M
YoY Change	-8.67%	42.13%	89.05%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$33.00M	$281.0M	$47.00M
YoY Change	-88.26%	295.77%	-66.19%
Total Short-Term Liabilities	$577.1M	$1.021B	$726.0M
YoY Change	-43.46%	93.68%	40.15%
LONG-TERM LIABILITIES
Long-Term Debt	$5.086B	$5.086B	$3.841B
YoY Change	0.0%	230.47%	149.74%
Other Long-Term Liabilities	$221.0M	$255.4M	$863.0M
YoY Change	-13.45%	-54.96%	48.54%
Total Long-Term Liabilities	$5.307B	$5.341B	$4.704B
YoY Change	-0.64%	153.62%	121.99%
TOTAL LIABILITIES
Total Short-Term Liabilities	$577.1M	$1.021B	$726.0M
Total Long-Term Liabilities	$5.307B	$5.341B	$4.704B
Total Liabilities	$7.152B	$6.624B	$6.322B
YoY Change	7.97%	150.64%	138.75%
SHAREHOLDERS EQUITY
Retained Earnings	-$104.0M	$622.4M
YoY Change	-116.72%
Common Stock	$3.029B	$3.017B
YoY Change	0.38%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$53.85M	$53.85M
YoY Change	0.0%
Treasury Stock Shares
Shareholders Equity	$2.855B	$3.578B	$3.533B
YoY Change
Total Liabilities & Shareholders Equity	$10.01B	$10.21B	$9.855B
YoY Change	-2.03%	109.26%	103.83%

Cashflow Statement

Concept	2012 Q4	2011 Q4	2011 Q3
OPERATING ACTIVITIES
Net Income	-$295.4M	$71.22M	$8.890M
YoY Change	-514.83%	47.75%	-80.96%
Depreciation, Depletion And Amortization	$125.8M	$146.3M	$139.5M
YoY Change	-14.01%	52.4%	50.37%
Cash From Operating Activities	-$23.60M	$170.8M	$157.2M
YoY Change	-113.82%	-28.95%	-20.32%
INVESTING ACTIVITIES
Capital Expenditures	-$95.30M	-$328.9M	-$109.1M
YoY Change	-71.02%	240.12%	118.64%
Acquisitions
YoY Change
Other Investing Activities	-$140.4M	$6.000M	$89.80M
YoY Change	-2440.0%	-119.61%	-3692.0%
Cash From Investing Activities	-$235.7M	-$322.9M	-$19.20M
YoY Change	-27.01%	153.65%	-63.36%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$18.40M
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	493.1M	131.6M	-61.70M
YoY Change	274.7%	-257.98%	-55.35%
NET CHANGE
Cash From Operating Activities	-23.60M	170.8M	157.2M
Cash From Investing Activities	-235.7M	-322.9M	-19.20M
Cash From Financing Activities	493.1M	131.6M	-61.70M
Net Change In Cash	233.8M	-20.50M	76.30M
YoY Change	-1240.49%	-168.79%	1038.81%
FREE CASH FLOW
Cash From Operating Activities	-$23.60M	$170.8M	$157.2M
Capital Expenditures	-$95.30M	-$328.9M	-$109.1M
Free Cash Flow	$71.70M	$499.7M	$266.3M
YoY Change	-85.65%	48.23%	7.73%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q4	us-gaap	Prepaid Royalties PrepaidRoyalties	11416000	USD
CY2011Q4	us-gaap	Prepaid Royalties PrepaidRoyalties	21944000	USD
CY2010	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	314657000	USD
CY2012	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	395225000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	383782000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	224418000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	380595000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	247539000	USD
CY2012Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	121029000	USD
CY2011Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	133331000	USD
CY2011Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	348207000	USD
CY2012Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	318018000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3352799000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2919544000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7950000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-16507000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	3026823000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	3015349000	USD
CY2011	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	540936000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4953000	shares
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11717000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10882000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11822000	USD
CY2011Q4	us-gaap	Advances To Affiliate AdvancesToAffiliate	35810000	USD
CY2012Q4	us-gaap	Advances To Affiliate AdvancesToAffiliate	43828000	USD
CY2010	us-gaap	Amortization Of Advance Royalty AmortizationOfAdvanceRoyalty	34605000	USD
CY2011	us-gaap	Amortization Of Advance Royalty AmortizationOfAdvanceRoyalty	34842000	USD
CY2012	us-gaap	Amortization Of Advance Royalty AmortizationOfAdvanceRoyalty	22650000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	20238000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	10398000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	14067000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	-25189000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	-22069000	USD
CY2010	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	35606000	USD
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	5200000	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2500000	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2600000	shares
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	346423000	USD
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges		USD
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges		USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	473903000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	448625000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	343119000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	33601000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	39020000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	27119000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	38920000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	115019000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-29000000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-68698000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	11176000	USD
CY2012	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	4400000	USD
CY2012Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	409705000	USD
CY2011Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	446784000	USD
CY2011Q4	us-gaap	Assets Assets	10213959000	USD
CY2012Q4	us-gaap	Assets Assets	10006777000	USD
CY2010Q4	us-gaap	Assets Assets	4880769000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	1914104000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	1182774000	USD
CY2012Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	271967000	USD
CY2012Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	755575000	USD
CY2011Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	1082035000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	5268000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	240382000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	223300000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	234305000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent		USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	7540000	USD
CY2012Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	239652000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	-2122000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	-3436000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	4394000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	2706000	USD
CY2012Q4	us-gaap	Borrowed Funds BorrowedFunds	5118775000	USD
CY2011Q4	us-gaap	Borrowed Funds BorrowedFunds	4043148000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	138149000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	784622000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	93593000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	61138000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	32455000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	44556000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	646473000	USD
	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Cost Of Sales Net CashFlowHedgeGainLossReclassifiedToCostOfSalesNet	16438000	USD
CY2012Q4	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Cost Of Sales Net CashFlowHedgeGainLossReclassifiedToCostOfSalesNet	2675000	USD
CY2010	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Cost Of Sales Net CashFlowHedgeGainLossReclassifiedToCostOfSalesNet	-2367000	USD
CY2011Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	35800000	USD
CY2012Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	35400000	USD
CY2011	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	4285895000	USD
CY2012	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	4159038000	USD
CY2010	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	3186268000	USD
CY2012Q2	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	1063538000	USD
CY2012Q3	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	1087618000	USD
CY2012Q1	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	1039651000	USD
CY2012Q4	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	968231000	USD
CY2011Q2	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	985528000	USD
CY2011Q1	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	872938000	USD
CY2011Q4	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	1228756000	USD
CY2011Q3	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	1198673000	USD
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.43
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.39
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	260000000	shares
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	260000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	213183000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	213759000	shares
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	2141000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	2136000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-692512000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	140150000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	172293000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-692239000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	172885000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	141240000	USD
CY2012Q4	us-gaap	Contractual Obligation Due In Next Twelve Months ContractualObligationDueInNextTwelveMonths	7600000	USD
CY2011	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	3267910000	USD
CY2012	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	3438013000	USD
CY2010	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	2395812000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-20022000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	34304000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-20164000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-18952000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-19447000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	36587000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	575000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1212000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2283000	USD
CY2011Q4	us-gaap	Debt Current DebtCurrent	280851000	USD
CY2012Q4	us-gaap	Debt Current DebtCurrent	32896000	USD
CY2011Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	4200000000	USD
CY2012Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	5000000000	USD
CY2012Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	333000000	USD
CY2010	us-gaap	Debt Related Commitment Fees And Debt Issuance Costs DebtRelatedCommitmentFeesAndDebtIssuanceCosts		USD
CY2012	us-gaap	Debt Related Commitment Fees And Debt Issuance Costs DebtRelatedCommitmentFeesAndDebtIssuanceCosts		USD
CY2011	us-gaap	Debt Related Commitment Fees And Debt Issuance Costs DebtRelatedCommitmentFeesAndDebtIssuanceCosts	49490000	USD
CY2011Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	32700000	USD
CY2012Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	31300000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	13214000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-322104000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-18506000	USD
CY2012Q4	us-gaap	Deferred Finance Costs Current Net DeferredFinanceCostsCurrentNet	17300000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Current Net DeferredFinanceCostsCurrentNet	15800000	USD
CY2012Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	101500000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	90500000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	11363000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-18873000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-314270000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-367000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1851000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7834000	USD
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CY2011Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	12400000	USD
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CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	426492000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	466845000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	78961000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	94644000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	51674000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	57403000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	280690000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	254163000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	19495000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	15308000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	25203000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Income Loss From Continuing Operations Before Extraordinary Items EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems	13180000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Income Loss From Continuing Operations Before Extraordinary Items EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems	8898000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Income Loss From Continuing Operations Before Extraordinary Items EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems	20243000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	426492000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	466845000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Minority Interest EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest	263000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Minority Interest EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest	161000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	6788000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	641000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	16015000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	387884000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	331848000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	120494000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	128489000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	184358000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	190661000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	172933000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	225605000	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	242215000	USD
CY2010Q4	us-gaap	Equity Method Investments EquityMethodInvestments	177451000	USD
CY2009Q4	us-gaap	Equity Method Investments EquityMethodInvestments	87268000	USD
CY2012Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	124900000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-13399000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	17312000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-1950000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	6211000	USD
CY2012Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	8174000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	-115322000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	-123776000	USD
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CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	34135000	USD
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CY2010	us-gaap	Gain Loss On Contract Termination GainLossOnContractTermination		USD
CY2012	us-gaap	Gain Loss On Contract Termination GainLossOnContractTermination	-58335000	USD
CY2011	us-gaap	Gain Loss On Contract Termination GainLossOnContractTermination		USD
CY2012	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-23668000	USD
CY2010	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-6776000	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1958000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	265423000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	596103000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	114963000	USD
CY2009Q4	us-gaap	Goodwill Goodwill	113701000	USD
CY2012	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	-330680000	USD
CY2012Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2012Q2	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	115791000	USD
CY2012Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	230632000	USD
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CY2012Q3	us-gaap	Gross Profit GrossProfit	69249000	USD
CY2012Q4	us-gaap	Gross Profit GrossProfit	37176000	USD
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CY2011Q1	us-gaap	Gross Profit GrossProfit	130523000	USD
CY2011Q2	us-gaap	Gross Profit GrossProfit	172234000	USD
CY2011Q4	us-gaap	Gross Profit GrossProfit	154388000	USD
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CY2012	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	95641000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	177108000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	135251000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-1017404000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	177108000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	135251000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1017404000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	11153000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	11311000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	8920000	USD
CY2012	us-gaap	Income Tax Effects Allocated Directly To Equity Employee Stock Options IncomeTaxEffectsAllocatedDirectlyToEquityEmployeeStockOptions	300000	USD
CY2010	us-gaap	Income Tax Effects Allocated Directly To Equity Employee Stock Options IncomeTaxEffectsAllocatedDirectlyToEquityEmployeeStockOptions	-800000	USD
CY2011	us-gaap	Income Tax Effects Allocated Directly To Equity Employee Stock Options IncomeTaxEffectsAllocatedDirectlyToEquityEmployeeStockOptions	-400000	USD
CY2012	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	200000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17714000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-333717000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7589000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	31832000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	2416000	USD
CY2010	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-383000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	61800000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-356185000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	46933000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-40698000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-49152000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-61971000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	56916000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses		USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses		USD
CY2010	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	3150000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-2159000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	8088000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-23423000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-3055000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2299000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	7094000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-28057000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	36765000	USD
CY2010	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	23997000	USD
CY2011	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	74914000	USD
CY2012	us-gaap	Interest Expense InterestExpense	317626000	USD
CY2010	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-140100000	USD
CY2012	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-312148000	USD
CY2011	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-226877000	USD
CY2012	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-113531000	USD
CY2010	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	7287000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-5167000	USD
CY2011	us-gaap	Interest Income Other InterestIncomeOther	3309000	USD
CY2010	us-gaap	Interest Income Other InterestIncomeOther	2449000	USD
CY2012	us-gaap	Interest Income Other InterestIncomeOther	5478000	USD
CY2010	us-gaap	Interest Paid InterestPaid	134866000	USD
CY2011	us-gaap	Interest Paid InterestPaid	213697000	USD
CY2012	us-gaap	Interest Paid InterestPaid	310241000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	55266000	USD
CY2012Q4	us-gaap	Interest Payable Current InterestPayableCurrent	42413000	USD
CY2012	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	-42531000	USD
CY2011	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	3868000	USD
CY2012	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	336036000	USD
CY2011	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-10519000	USD
CY2010	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	12405000	USD
CY2011	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-21759000	USD
CY2012	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	27545000	USD
CY2010	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-1364000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	50900000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-9468000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-5160000	USD
CY2010	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	87807000	USD
CY2012	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-171580000	USD
CY2011	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	52191000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	11359000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-11245000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-9700000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-6869000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash		USD
CY2012	us-gaap	Increase Decrease In Restricted Cash And Investments IncreaseDecreaseInRestrictedCashAndInvestments	-6869000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash And Investments IncreaseDecreaseInRestrictedCashAndInvestments	-5167000	USD
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	812000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	819000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2012	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	15600000	USD
CY2011	us-gaap	Interest Expense InterestExpense	230186000	USD
CY2010	us-gaap	Interest Expense InterestExpense	142549000	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	365424000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	377490000	USD
CY2011Q4	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	163527000	USD
CY2012Q4	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	172139000	USD
CY2011Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	13100000	USD
CY2012Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	13600000	USD
CY2012Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	12368000	USD
CY2011Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	7446000	USD
CY2012	us-gaap	Inventory Write Down InventoryWriteDown	2598000	USD
CY2010	us-gaap	Investments In And Advances To Affiliates At Fair Value Gross Additions InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions	87405000	USD
CY2011	us-gaap	Investments In And Advances To Affiliates At Fair Value Gross Additions InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions	43489000	USD
CY2012	us-gaap	Investments In And Advances To Affiliates At Fair Value Gross Additions InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions		USD
CY2012	us-gaap	Investments In And Advances To Affiliates At Fair Value Period Increase Decrease InvestmentsInAndAdvancesToAffiliatesAtFairValuePeriodIncreaseDecrease	7690000	USD
CY2010	us-gaap	Investments In And Advances To Affiliates At Fair Value Period Increase Decrease InvestmentsInAndAdvancesToAffiliatesAtFairValuePeriodIncreaseDecrease	-8375000	USD
CY2011	us-gaap	Investments In And Advances To Affiliates At Fair Value Period Increase Decrease InvestmentsInAndAdvancesToAffiliatesAtFairValuePeriodIncreaseDecrease	-6646000	USD
CY2012Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	18000000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	7152210000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	6624385000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	10006777000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	10213959000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	577069000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1020668000	USD
CY2011Q4	us-gaap	Line Of Credit LineOfCredit	481300000	USD
CY2012Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2012	us-gaap	Line Of Credit Facility Covenant Terms LineOfCreditFacilityCovenantTerms	Terms of the Company's credit facilities and leases contain financial and other covenants that limit the ability of the Company to, among other things, acquire, dispose, merge or consolidate assets; incur additional debt; pay dividends and make distributions or repurchase stock; make investments; create liens; issue and sell capital stock of subsidiaries; enter into restrictions affecting the ability of restricted subsidiaries to make distributions, loans or advances to the Company; engage in transactions with affiliates and enter into sale and leaseback transactions. In addition, the covenants require the Company to pledge assets to collateralize the revolving credit and term loan facilities. The assets pledged include equity interests in wholly‑owned subsidiaries, certain real property interests, accounts receivable and inventory of the Company. Failure by the Company to comply with such covenants could result in an event of default, which, if not cured or waived, could have a material adverse effect on the Company.
CY2012Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	600000000	USD
CY2012Q1	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	2000000000	USD
CY2012Q4	us-gaap	Litigation Reserve LitigationReserve	32800000	USD
CY2011Q4	us-gaap	Litigation Reserve LitigationReserve	117200000	USD
CY2012Q4	us-gaap	Litigation Reserve Current LitigationReserveCurrent	4400000	USD
CY2011Q4	us-gaap	Litigation Reserve Current LitigationReserveCurrent	6300000	USD
CY2012Q4	us-gaap	Long Lived Assets To Be Abandoned Carrying Value Of Asset LongLivedAssetsToBeAbandonedCarryingValueOfAsset	51000000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	34700000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	21100000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	620900000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	20800000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	20600000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5085879000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3762297000	USD
CY2010	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod		USD
CY2012	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	-79532000	USD
CY2011	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod		USD
CY2012Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	409705000	USD
CY2011Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	446784000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest		USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	11534000	USD
CY2012	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-5474000	USD
CY2012Q2	us-gaap	Minority Interest Ownership Percentage By Noncontrolling Owners MinorityInterestOwnershipPercentageByNoncontrollingOwners	0.005
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	962835000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-275563000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2899230000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-389129000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3496916000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-649166000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	642242000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	697147000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	332804000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	158857000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	-683955000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	141683000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	268000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1157000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	537000	USD
CY2010	us-gaap	Nonmonetary Transaction Gain Loss Recognized On Transfer NonmonetaryTransactionGainLossRecognizedOnTransfer	41577000	USD
CY2012	us-gaap	Nonmonetary Transaction Gain Loss Recognized On Transfer NonmonetaryTransactionGainLossRecognizedOnTransfer		USD
CY2011	us-gaap	Nonmonetary Transaction Gain Loss Recognized On Transfer NonmonetaryTransactionGainLossRecognizedOnTransfer		USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-51448000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-6776000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-23668000	USD
CY2012Q4	us-gaap	Notes Payable NotesPayable		USD
CY2011Q4	us-gaap	Notes Payable NotesPayable		USD
CY2012Q4	us-gaap	Notes Receivable Related Parties NotesReceivableRelatedParties		USD
CY2011Q4	us-gaap	Notes Receivable Related Parties NotesReceivableRelatedParties		USD
CY2012	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	Segment
CY2010	us-gaap	Operating Expenses OperatingExpenses	2862284000	USD
CY2011	us-gaap	Operating Expenses OperatingExpenses	3872319000	USD
CY2012	us-gaap	Operating Expenses OperatingExpenses	4840626000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	-681588000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	323984000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	413576000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-588984000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	54081000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-282645000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	135960000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	139728000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	102238000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	95354000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	76256000	USD
CY2012	us-gaap	Operating Leases Rent Expense Minimum Rentals OperatingLeasesRentExpenseMinimumRentals	11546000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	41200000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	43900000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	41600000	USD
CY2012Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	1300000000	USD
CY2008Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	145100000	USD
CY2012	us-gaap	Operating Loss Carryforwards Expiration Dates OperatingLossCarryforwardsExpirationDates	expire between 2024 and 2032
CY2009	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-500000	USD
CY2012	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-465000	USD
CY2010	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-1036000	USD
CY2011	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-62000	USD
CY2012	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	1080000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	9345000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	15406000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-21265000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-10679000	USD
CY2012Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	18842000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	17061000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	92469000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	110304000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	160164000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	173701000	USD
CY2012	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-3000000	USD
CY2011	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	176000	USD
CY2010	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	2877000	USD
CY2010	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1341000	USD
CY2011	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1455000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-18286000	USD
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-20539000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-4676000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	4271000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-14523000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	9814000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-3342000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-5546000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	7655000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	-11951000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	2711000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	10895000	USD
CY2009	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	1186000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	2244000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-4729000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	2921000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	-976000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1600000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8552000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	13491000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-19853000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6417000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-16507000	USD
CY2011Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	21903000	USD
CY2010	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	15182000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	-3922000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	4301000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1920000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1841000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	114000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	20994000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-2430000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-13370000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-7650000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	1735000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	6973000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-7950000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-5936000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-9915000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	13605000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax		USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	4000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax		USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-10563000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	2653000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	1514000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	4813000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	897000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-7558000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	4320000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	2913000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	221000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1924000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1841000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	114000	USD
CY2011	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	-22069000	USD
CY2010	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	35606000	USD
CY2012	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	-25189000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	255382000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	221030000	USD
CY2012Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	40350000	USD
CY2012	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	20219000	USD
CY2011	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	10941000	USD
CY2012	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	-17500000	USD
CY2010	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates		USD
CY2012Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	194220000	USD
CY2011Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	187634000	USD
CY2012Q4	us-gaap	Prepaid Expense And Other Assets Noncurrent PrepaidExpenseAndOtherAssetsNoncurrent	755575000	USD
CY2011Q4	us-gaap	Prepaid Expense And Other Assets Noncurrent PrepaidExpenseAndOtherAssetsNoncurrent	1082035000	USD
CY2011Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	42309000	USD
CY2012Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	45086000	USD
CY2012Q4	us-gaap	Other Receivables OtherReceivables	84541000	USD
CY2011Q4	us-gaap	Other Receivables OtherReceivables	88584000	USD
CY2012	us-gaap	Payments For Proceeds From Previous Acquisition PaymentsForProceedsFromPreviousAcquisition		USD
CY2011	us-gaap	Payments For Proceeds From Previous Acquisition PaymentsForProceedsFromPreviousAcquisition	829000	USD
CY2010	us-gaap	Payments For Proceeds From Previous Acquisition PaymentsForProceedsFromPreviousAcquisition	1262000	USD
CY2012	us-gaap	Payments Of Dividends PaymentsOfDividends	42440000	USD
CY2010	us-gaap	Payments Of Dividends PaymentsOfDividends	63373000	USD
CY2011	us-gaap	Payments Of Dividends PaymentsOfDividends	80748000	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	114823000	USD
CY2010	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	12751000	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	50568000	USD
CY2011	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates		USD
CY2011	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2894339000	USD
CY2012	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired		USD
CY2010	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired		USD
CY2011	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments		USD
CY2010	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments		USD
CY2012	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	236862000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	540936000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	395225000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	314657000	USD
CY2011	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	29957000	USD
CY2012	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	13269000	USD
CY2010	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	27355000	USD
CY2013	us-gaap	Pension Contributions PensionContributions	900000	USD
CY2011Q4	us-gaap	Prepaid Mineral Royalties Noncurrent PrepaidMineralRoyaltiesNoncurrent	86626000	USD
CY2012Q4	us-gaap	Prepaid Mineral Royalties Noncurrent PrepaidMineralRoyaltiesNoncurrent	87773000	USD
CY2011	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders		USD
CY2010	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	891000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	9121000	USD
CY2012Q4	us-gaap	Price Risk Cash Flow Hedge Unrealized Gain Loss To Be Reclassified During Next12 Months PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months	2200000	USD
CY2010	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates		USD
CY2012	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates		USD
CY2011	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates		USD
CY2012	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent		USD
CY2011	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent		USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock		USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1267933000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock		USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt		USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1633500000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt		USD
CY2011	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	2000000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	500000000	USD
CY2012	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	359753000	USD
CY2012	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders		USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-7625000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities		USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities		USD
CY2010	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	82000	USD
CY2011	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	5334000	USD
CY2012	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-682000	USD
CY2011	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	-605178000	USD
CY2010	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	-505627000	USD
CY2012	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	-452934000	USD
CY2011	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	25887000	USD
CY2012	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	22825000	USD
CY2010	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	330000	USD
CY2012	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	1754000	USD
CY2011	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments		USD
CY2010	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments		USD
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	5131000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1764000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2316000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	142840000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	159394000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	-683687000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	1409000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	45751000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	-295423000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	-435424000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	6630000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	71215000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	55874000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10689897000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10868694000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	7337098000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	7949150000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	3225985000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	3391265000	USD
CY2012Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	332080000	USD
CY2011Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	469179000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10322000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	3453000	USD
CY2012	us-gaap	Restructuring And Related Cost Number Of Positions Eliminated RestructuringAndRelatedCostNumberOfPositionsEliminated	750
CY2011	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	7316000	USD
CY2010	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges		USD
CY2012	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	515491000	USD
CY2010	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions		USD
CY2011	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	7316000	USD
CY2012	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	523568000	USD
CY2012Q4	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	0	USD
CY2012Q1	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	0	USD
CY2012Q3	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	-2194000	USD
CY2012Q2	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	525762000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-104042000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	622353000	USD
CY2012	us-gaap	Royalty Expense RoyaltyExpense	302000000	USD
CY2011	us-gaap	Royalty Expense RoyaltyExpense	349000000	USD
CY2010	us-gaap	Royalty Expense RoyaltyExpense	286800000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	26.72
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	25.99
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	9.79
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	527000	shares
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1267933000	USD
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	13.89
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	13.28
CY2011	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2010	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	118177000	USD
CY2012	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	134299000	USD
CY2011	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	119056000	USD
CY2012	us-gaap	Severance Costs SeveranceCosts	12274000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	10882000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	11822000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	11717000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0292
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0199
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0125
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.6072
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.571
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.574
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0192
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0216
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0076
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	18000000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2847000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	32.26
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1800000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3000000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	2600000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	449000	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	31.17
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	73000	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	1311000	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	9.43
CY2010	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2012	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	5131000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1764000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2316000	USD
CY2012	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	8000000	USD
CY2010	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	10600000	USD
CY2011	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	8800000	USD
CY2012Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	14000000	shares
CY2010	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P4Y6M
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	5.27
CY2012Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	10925800	shares
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	3578040000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	2854567000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	14.18
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	4000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	2237507000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	2115106000	USD
CY2011	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P4Y6M
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P4Y6M
CY2012Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	0	USD
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P5Y4M24D
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P6Y8M3D
CY2011Q4	aci	Coal Derivative Liabilities CoalDerivativeLiabilities	7828000	USD
CY2012Q4	aci	Coal Derivative Liabilities CoalDerivativeLiabilities	1737000	USD
CY2012Q4	aci	Coal Supply Agreement Liability CoalSupplyAgreementLiability	14038000	USD
CY2012Q4	aci	Effect Of Counterparty Netting In Derivative Assets EffectOfCounterpartyNettingInDerivativeAssets	-22548000	USD
CY2011Q4	aci	Coal Supply Agreement Liability CoalSupplyAgreementLiability	38441000	USD
CY2011Q4	aci	Effect Of Counterparty Netting In Derivative Liabilities EffectOfCounterpartyNettingInDerivativeLiabilities	18134000	USD
CY2012Q4	aci	Coallandsandmineralrights Coallandsandmineralrights	6218776000	USD
CY2011Q4	aci	Coallandsandmineralrights Coallandsandmineralrights	6578430000	USD
CY2012Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	150000000	USD
CY2012	us-gaap	Trading Activity Gains And Losses Net TradingActivityGainsAndLossesNet	8300000	USD
CY2010	us-gaap	Trading Activity Gains And Losses Net TradingActivityGainsAndLossesNet	2100000	USD
CY2011	us-gaap	Trading Activity Gains And Losses Net TradingActivityGainsAndLossesNet	-3500000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	53848000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	53848000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-3830000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	800000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	409000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1493000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1626000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	21943000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	85000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2754000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	8798000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	31150000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	4418000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	6670000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	98600000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	216200000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	102500000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	135300000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	135100000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	445600000	USD
CY2012Q4	aci	Coalsupplyagreementgrossobligationliability Coalsupplyagreementgrossobligationliability	166697000	USD
CY2011Q4	aci	Coalsupplyagreementgrossobligationliability Coalsupplyagreementgrossobligationliability	166697000	USD
CY2011Q4	aci	Coalsupplyagreementobligationnet Coalsupplyagreementobligationnet	96998000	USD
CY2012Q4	aci	Coalsupplyagreementobligationnet Coalsupplyagreementobligationnet	61460000	USD
CY2012Q4	aci	Commitments For Future Development Financing For Equity Method Investees CommitmentsForFutureDevelopmentFinancingForEquityMethodInvestees	72900000	USD
CY2011Q3	aci	Damages And Interest Awarded DamagesAndInterestAwarded	104100000	USD
CY2012Q4	aci	Deferredminedevelopment Deferredminedevelopment	1079856000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;padding-left:24px;text-indent:-12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Accounting Estimates </font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses in the accompanying consolidated financial statements and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. </font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;padding-left:24px;text-indent:-12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;"></font></div></div>
CY2012	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	31800000	USD
CY2010	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-400000	USD
CY2011	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	2100000	USD
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	211381000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	163210000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	190905000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	190086000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	211381000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	162398000	shares
CY2011Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	11666000	USD
CY2012Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	10371000	USD
CY2011Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	71948000	USD
CY2012Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	81629000	USD
CY2012Q4	aci	Accrued Expenses And Other Current Liabilities AccruedExpensesAndOtherCurrentLiabilities	318018000	USD
CY2011Q4	aci	Accrued Expenses And Other Current Liabilities AccruedExpensesAndOtherCurrentLiabilities	348207000	USD
CY2012Q4	aci	Accrued Expenses Derivatives And Other Liabilities Current AccruedExpensesDerivativesAndOtherLiabilitiesCurrent	319755000	USD
CY2011Q4	aci	Accrued Expenses Derivatives And Other Liabilities Current AccruedExpensesDerivativesAndOtherLiabilitiesCurrent	356035000	USD
CY2012	aci	Acquisition And Transition Costs Related To Icg AcquisitionAndTransitionCostsRelatedToIcg		USD
CY2011	aci	Acquisition And Transition Costs Related To Icg AcquisitionAndTransitionCostsRelatedToIcg	47360000	USD
CY2010	aci	Acquisition And Transition Costs Related To Icg AcquisitionAndTransitionCostsRelatedToIcg		USD
CY2012	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	-16590000	USD
CY2010	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	8924000	USD
CY2011	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	-2907000	USD
CY2011Q4	aci	Coal Derivative Assets CoalDerivativeAssets	13335000	USD
CY2012Q4	aci	Coal Derivative Assets CoalDerivativeAssets	22975000	USD
CY2011Q4	aci	Deferredminedevelopment Deferredminedevelopment	1064279000	USD
CY2012	aci	Coal Derivative Assets And Liabilities CoalDerivativeAssetsAndLiabilities	13158000	USD
CY2011	aci	Coal Derivative Assets And Liabilities CoalDerivativeAssetsAndLiabilities	-6079000	USD
CY2012Q4	aci	Deferredtaxassetsplantandequipment Deferredtaxassetsplantandequipment	32087000	USD
CY2010	aci	Coal Derivative Assets And Liabilities CoalDerivativeAssetsAndLiabilities	-9554000	USD
CY2012Q4	aci	Effect Of Counterparty Netting In Derivative Liabilities EffectOfCounterpartyNettingInDerivativeLiabilities	22548000	USD
CY2011Q4	aci	Deferredtaxliabilitiesplantandequipment Deferredtaxliabilitiesplantandequipment	1566769000	USD
CY2012Q4	aci	Deferredtaxliabilitiesplantandequipment Deferredtaxliabilitiesplantandequipment	1411446000	USD
CY2011Q4	aci	Deferredtaxassetsplantandequipment Deferredtaxassetsplantandequipment	24456000	USD
CY2011Q4	aci	Effect Of Counterparty Netting In Derivative Assets EffectOfCounterpartyNettingInDerivativeAssets	-18134000	USD
CY2011Q4	aci	Finitelivedcoalsupplyagreementsgross Finitelivedcoalsupplyagreementsgross	149457000	USD
CY2012Q4	aci	Finitelivedcoalsupplyagreementsgross Finitelivedcoalsupplyagreementsgross	131819000	USD
CY2012Q4	aci	Finitelivedintangibleliabilitiesaccumulatedamortization Finitelivedintangibleliabilitiesaccumulatedamortization	-105237000	USD
CY2011Q4	aci	Finitelivedintangibleliabilitiesaccumulatedamortization Finitelivedintangibleliabilitiesaccumulatedamortization	-69699000	USD
CY2012	aci	Gain Loss On Components Excluded From Assessment Of Price Risk Hedge Effectiveness Net Of Tax GainLossOnComponentsExcludedFromAssessmentOfPriceRiskHedgeEffectivenessNetOfTax	5200000	USD
CY2012	aci	Goodssoldduringyear Goodssoldduringyear	140800000
CY2012	aci	Impairment Of Coal Properties And Deferred Development Costs ImpairmentOfCoalPropertiesAndDeferredDevelopmentCosts	403279000	USD
CY2010	aci	Income From Investment In Subsidiaries IncomeFromInvestmentInSubsidiaries		USD
CY2012	aci	Income From Investment In Subsidiaries IncomeFromInvestmentInSubsidiaries		USD
CY2011	aci	Income From Investment In Subsidiaries IncomeFromInvestmentInSubsidiaries		USD
CY2012Q4	aci	Investment In Subsidiaries InvestmentInSubsidiaries		USD
CY2011Q4	aci	Investment In Subsidiaries InvestmentInSubsidiaries		USD
CY2012Q4	aci	Letters Of Credit Posted In Companys Favor LettersOfCreditPostedInCompanysFavor	16700000	USD
CY2012	aci	Longtermcontractslifetermmaximum Longtermcontractslifetermmaximum	P8Y
CY2012	aci	Longtermcontractslifetermminimum Longtermcontractslifetermminimum	P1Y
CY2012	aci	Maximum Dividend Allowed By Credit Facility MaximumDividendAllowedByCreditFacility	0.03
CY2010	aci	Net Proceeds From Commercial Paper And Net Borrowings On Lines Of Credit NetProceedsFromCommercialPaperAndNetBorrowingsOnLinesOfCredit	-196549000	USD
CY2011	aci	Net Proceeds From Commercial Paper And Net Borrowings On Lines Of Credit NetProceedsFromCommercialPaperAndNetBorrowingsOnLinesOfCredit	424396000	USD
CY2012	aci	Net Proceeds From Commercial Paper And Net Borrowings On Lines Of Credit NetProceedsFromCommercialPaperAndNetBorrowingsOnLinesOfCredit	-481300000	USD
CY2012	aci	Netamountreclassifiedtoincome Netamountreclassifiedtoincome	918000	USD
CY2011	aci	Netamountreclassifiedtoincome Netamountreclassifiedtoincome	1665000	USD
CY2010	aci	Netamountreclassifiedtoincome Netamountreclassifiedtoincome	101000	USD
CY2010Q4	aci	Netincomeexpenserelatedtodeferredcompensationplan Netincomeexpenserelatedtodeferredcompensationplan	-2800000	USD
CY2012Q4	aci	Netincomeexpenserelatedtodeferredcompensationplan Netincomeexpenserelatedtodeferredcompensationplan	3300000	USD
CY2011Q4	aci	Netincomeexpenserelatedtodeferredcompensationplan Netincomeexpenserelatedtodeferredcompensationplan	6200000	USD
CY2012Q4	aci	Nettotalofacquiredsalescontractsliabilities Nettotalofacquiredsalescontractsliabilities	-53417000	USD
CY2011Q4	aci	Nettotalofacquiredsalescontractsliabilities Nettotalofacquiredsalescontractsliabilities	-62863000	USD
CY2012	aci	Number Of Mining Complexes Closed NumberOfMiningComplexesClosed	4	mining_complex
CY2012	aci	Number Of Mining Complexes Temporarily Idled NumberOfMiningComplexesTemporarilyIdled	1	mining_complex
CY2012	aci	Number Of Operated Mining Complexes NumberOfOperatedMiningComplexes	15
CY2012	aci	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	17758000	USD
CY2010	aci	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	46185000	USD
CY2012	aci	Participantsmaximumdifferedamountinannualincentiveawardspercentage Participantsmaximumdifferedamountinannualincentiveawardspercentage	1
CY2012	aci	Participantsmaximumdifferedamountinbasesalariespercentage Participantsmaximumdifferedamountinbasesalariespercentage	0.85
CY2012	aci	Participantsmaximumdifferedsharesinrestrictedstockunitorperformancecontingentstockawardspercentage Participantsmaximumdifferedsharesinrestrictedstockunitorperformancecontingentstockawardspercentage	1
CY2012	aci	Percentage Company Revenue PercentageCompanyRevenue	0.50
CY2012	aci	Percentageofgoodssoldunderlongtermcontract Percentageofgoodssoldunderlongtermcontract	0.70
CY2007Q3	aci	Purchase Replacement Coal PurchaseReplacementCoal	100000000	USD
CY2011	aci	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	61909000	USD
CY2012	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsforfeituresinperiod Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsforfeituresinperiod	17000	shares
CY2012	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsforfeituresinperiodweightedaveragegrantdatefairvalue Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsforfeituresinperiodweightedaveragegrantdatefairvalue	9.81
CY2012	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsgrantsinperiod Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsgrantsinperiod	1311000	shares
CY2012	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsgrantsinperiodweightedaveragegrantdatefairvalue Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsgrantsinperiodweightedaveragegrantdatefairvalue	5.27
CY2011Q4	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsoutstandingnumber Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsoutstandingnumber	1796000	shares
CY2012Q4	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsoutstandingnumber Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsoutstandingnumber	2369000	shares
CY2012	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsvested Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsvested	721000	shares
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	212246799	shares
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	1400000000	USD
CY2011	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsvestedinperiodfairvaluemonetary Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsvestedinperiodfairvaluemonetary	9900000	USD
CY2010	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsvestedinperiodfairvaluemonetary Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsvestedinperiodfairvaluemonetary	10600000	USD
CY2012	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsvestedinperiodfairvaluemonetary Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsvestedinperiodfairvaluemonetary	8000000	USD
CY2012	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsvestedinperiodweightedaveragegrantdatefairvalue Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsvestedinperiodweightedaveragegrantdatefairvalue	11.13
CY2012Q4	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsweightedaveragegrantdatefairvalue Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsweightedaveragegrantdatefairvalue	7.77
CY2011Q4	aci	Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsweightedaveragegrantdatefairvalue Sharebasedcompensationarrangementbysharebasedpaymentawardunvestedoptionsweightedaveragegrantdatefairvalue	10.96
CY2012	aci	Suretybondsandlettersofcreditoutstanding Suretybondsandlettersofcreditoutstanding	61100000	USD
CY2012Q4	aci	Suretybondsoutstanding Suretybondsoutstanding	262900000	USD
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001037676
CY2012	dei	Entity Registrant Name EntityRegistrantName	ARCH COAL INC
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

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$ARCH
ARCH RESOURCES, INC. Stock $arch

2012 Q4 Form 10-K Financial Statement

#000104746913002059 Filed on March 01, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCH ARCH RESOURCES, INC. Stock $arch

2012 Q4 Form 10-K Financial Statement

#000104746913002059 Filed on March 01, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCH
ARCH RESOURCES, INC. Stock $arch