$NFG
NATIONAL FUEL GAS CO Stock $nfg

$nfg Overview Financials Valuation SEC Filings Company Website

2013 Q3 Form 10-K Financial Statement

#000007014514000095 Filed on November 21, 2014

Income Statement

Concept	2013 Q3	2013 Q2	2013 Q1
Revenue	$338.9M	$440.0M	$597.8M
YoY Change	8.17%	33.78%	8.24%
Cost Of Revenue	$33.50M	$95.20M	$209.8M
YoY Change	35.63%	89.64%	0.62%
Gross Profit	$305.4M	$344.8M	$388.0M
YoY Change	5.82%	23.72%	12.86%
Gross Profit Margin	90.12%	78.36%	64.9%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$86.30M	$88.14M	$80.03M
YoY Change	20.53%	18.79%	26.63%
% of Gross Profit	28.26%	25.56%	20.63%
Operating Expenses	$208.7M	$313.0M	$434.8M
YoY Change	15.11%	66.14%	105.4%
Operating Profit	$96.64M	$127.0M	$163.0M
YoY Change	-9.94%	40.65%	23.38%
Interest Expense	-$21.50M	-$24.00M	-$23.20M
YoY Change	3.37%	9.09%	7.91%
% of Operating Profit	-22.25%	-18.9%	-14.23%
Other Income/Expense, Net	$1.000M	$1.200M	$1.100M
YoY Change	-9.09%	9.09%	-35.29%
Pretax Income	$76.20M	$104.2M	$140.9M
YoY Change	-12.91%	50.12%	25.47%
Income Tax	$28.30M	$45.69M	$55.19M
% Of Pretax Income	37.14%	43.85%	39.17%
Net Earnings	$47.84M	$58.50M	$85.72M
YoY Change	-1.97%	35.41%	27.2%
Net Earnings / Revenue	14.12%	13.29%	14.34%
Basic Earnings Per Share	$0.57	$0.70	$1.03
Diluted Earnings Per Share	$0.57	$0.69	$1.02
COMMON SHARES
Basic Shares Outstanding		83.56M shares	83.50M shares
Diluted Shares Outstanding		84.33M shares	84.16M shares

Balance Sheet

Concept	2013 Q3	2013 Q2	2013 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$64.90M	$134.6M	$112.4M
YoY Change	-12.89%	-4.4%	-41.52%
Cash & Equivalents	$64.86M	$134.6M	$112.4M
Short-Term Investments
Other Short-Term Assets	$56.91M	$75.70M	$126.8M
YoY Change	-32.74%	-5.73%	16.87%
Inventory	$81.40M	$53.80M	$46.00M
Prepaid Expenses
Receivables	$133.2M	$165.0M	$203.1M
Other Receivables	$0.00	$0.00	$1.600M
Total Short-Term Assets	$448.7M	$429.1M	$490.0M
YoY Change	26.17%	10.48%	-5.11%
LONG-TERM ASSETS
Property, Plant & Equipment	$5.152B	$5.014B	$4.947B
YoY Change	8.69%	8.51%	11.66%
Goodwill	$5.476M
YoY Change
Intangibles
YoY Change
Long-Term Investments	$96.30M	$93.70M	$92.70M
YoY Change	10.94%	10.89%	8.29%
Other Assets	$2.447M	$801.5M	$739.9M
YoY Change	-99.67%	8.66%	-7.27%
Total Long-Term Assets	$617.9M	$5.915B	$5.785B
YoY Change	-88.92%	8.56%	8.75%
TOTAL ASSETS
Total Short-Term Assets	$448.7M	$429.1M	$490.0M
Total Long-Term Assets	$617.9M	$5.915B	$5.785B
Total Assets	$6.205B	$6.344B	$6.275B
YoY Change	4.55%	8.69%	7.53%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$105.3M	$77.50M	$95.10M
YoY Change	19.64%	-12.03%	-3.06%
Accrued Expenses	$22.83M	$128.9M	$170.8M
YoY Change	-78.98%	-27.26%	-24.89%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change	-100.0%	-100.0%	-100.0%
Long-Term Debt Due	$0.00	$0.00	$0.00
YoY Change	-100.0%	-100.0%	-100.0%
Total Short-Term Liabilities	$302.2M	$269.4M	$373.4M
YoY Change	-58.86%	-59.61%	-48.6%
LONG-TERM LIABILITIES
Long-Term Debt	$1.649B	$1.649B	$1.649B
YoY Change	43.52%	43.52%	43.52%
Other Long-Term Liabilities	$725.4M	$1.051B	$1.031B
YoY Change	-29.28%	8.45%	8.21%
Total Long-Term Liabilities	$2.072B	$2.700B	$2.680B
YoY Change	80.37%	27.48%	27.51%
TOTAL LIABILITIES
Total Short-Term Liabilities	$302.2M	$269.4M	$373.4M
Total Long-Term Liabilities	$2.072B	$2.700B	$2.680B
Total Liabilities	$2.375B	$4.207B	$4.233B
YoY Change	-40.26%	9.34%	9.41%
SHAREHOLDERS EQUITY
Retained Earnings	$1.443B	$1.426B	$1.399B
YoY Change	10.44%
Common Stock	$83.66M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.195B	$2.137B	$2.042B
YoY Change
Total Liabilities & Shareholders Equity	$6.218B	$6.344B	$6.275B
YoY Change	4.77%	8.69%	7.53%

Cashflow Statement

Concept	2013 Q3	2013 Q2	2013 Q1
OPERATING ACTIVITIES
Net Income	$47.84M	$58.50M	$85.72M
YoY Change	-1.97%	35.41%	27.2%
Depreciation, Depletion And Amortization	$86.30M	$88.14M	$80.03M
YoY Change	20.53%	18.79%	26.63%
Cash From Operating Activities	$151.4M	$220.3M	$220.9M
YoY Change	77.7%	1.43%	-15.33%
INVESTING ACTIVITIES
Capital Expenditures	-$190.1M	-$173.7M	-$176.7M
YoY Change	-15.62%	-40.6%	-34.12%
Acquisitions
YoY Change
Other Investing Activities	$1.400M	-$500.0K	$100.0K
YoY Change	-17.65%	0.0%	-50.0%
Cash From Investing Activities	-$188.7M	-$174.1M	-$176.7M
YoY Change	-15.65%	-40.54%	-34.07%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-32.30M	-24.10M	7.100M
YoY Change	-144.86%	-199.18%	-128.51%
NET CHANGE
Cash From Operating Activities	151.4M	220.3M	220.9M
Cash From Investing Activities	-188.7M	-174.1M	-176.7M
Cash From Financing Activities	-32.30M	-24.10M	7.100M
Net Change In Cash	-69.60M	22.10M	51.30M
YoY Change	4.66%	-143.08%	-260.31%
FREE CASH FLOW
Cash From Operating Activities	$151.4M	$220.3M	$220.9M
Capital Expenditures	-$190.1M	-$173.7M	-$176.7M
Free Cash Flow	$341.5M	$394.0M	$397.6M
YoY Change	9.98%	-22.68%	-24.85%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2013Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	105283000	USD
CY2014Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	136674000	USD
CY2014Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	25663000	USD
CY2013Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	19483000	USD
CY2013	us-gaap	Accretion Of Discount AccretionOfDiscount	234353000	USD
CY2014	us-gaap	Accretion Of Discount AccretionOfDiscount	279563000	USD
CY2012	us-gaap	Accretion Of Discount AccretionOfDiscount	120974000	USD
CY2014Q3	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	1145000	USD
CY2013Q3	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	1579000	USD
CY2013Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2161477000	USD
CY2014Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2502700000	USD
CY2013Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-19234000	USD
CY2014Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3979000	USD
CY2013	us-gaap	Acquisition Costs AcquisitionCosts	905000	USD
CY2012	us-gaap	Acquisition Costs AcquisitionCosts	5585000	USD
CY2014	us-gaap	Acquisition Costs AcquisitionCosts	7057000	USD
CY2013Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	687684000	USD
CY2014Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	716144000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10500000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7200000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11500000	USD
CY2014Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	31811000	USD
CY2013Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	27144000	USD
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	844872	shares
CY2014	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1007	shares
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	181418	shares
CY2012Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	119246000	USD
CY2014Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	117713000	USD
CY2013Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	119511000	USD
CY2011Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	75731000	USD
CY2013	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6805000	USD
CY2014	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	7653000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	4859000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1744000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	2997000	USD
CY2014	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	6955000	USD
CY2014Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	117713000	USD
CY2013Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	119511000	USD
CY2014Q3	us-gaap	Assets Assets	6739597000	USD
CY2013Q3	us-gaap	Assets Assets	6218347000	USD
CY2012Q3	us-gaap	Assets Assets	5935142000	USD
CY2014Q3	us-gaap	Assets Current AssetsCurrent	377332000	USD
CY2013Q3	us-gaap	Assets Current AssetsCurrent	448677000	USD
CY2013Q3	us-gaap	Assets Noncurrent AssetsNoncurrent	617944000	USD
CY2014Q3	us-gaap	Assets Noncurrent AssetsNoncurrent	619174000	USD
CY2013	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	81138000	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	67503000	USD
CY2014	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	136628000	USD
CY2014Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	4059683000	USD
CY2013Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	3843729000	USD
CY2014Q3	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	1211610000	USD
CY2013Q3	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	919989000	USD
CY2014Q3	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	75700000	USD
CY2013Q3	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	80600000	USD
CY2012	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	6990000	USD
CY2013	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	1582000	USD
CY2014	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	84041000	USD
CY2013Q3	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	3499697000	USD
CY2014Q3	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	4082862000	USD
CY2014Q3	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	2871252000	USD
CY2013Q3	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	2579708000	USD
CY2013Q3	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	3393612000	USD
CY2014Q3	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	3941143000	USD
CY2013Q3	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	106085000	USD
CY2014Q3	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	141719000	USD
CY2012Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	74494000	USD
CY2011Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	80428000	USD
CY2014Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	36886000	USD
CY2013Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	64858000	USD
CY2014Q3	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	23794000	USD
CY2013Q3	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	51332000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-27972000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-5934000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-9636000	USD
CY2014Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	36886000	USD
CY2013Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	64858000	USD
CY2014	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	41100000	USD
CY2014Q3	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	44400000	USD
CY2013Q3	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	57600000	USD
CY2013Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	83661969	shares
CY2014Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	84157220	shares
CY2014Q3	us-gaap	Commercial Paper CommercialPaper	300000000	USD
CY2014Q3	us-gaap	Commercial Paper At Carrying Value CommercialPaperAtCarryingValue	85600000	USD
CY2013Q3	us-gaap	Commercial Paper At Carrying Value CommercialPaperAtCarryingValue	0	USD
CY2013Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2014Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2014	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.52
CY2012	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.44
CY2013	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.48
CY2014Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.375
CY2013Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.375
CY2014Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.385
CY2013Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.365
CY2012Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.365
CY2013Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.375
CY2014Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.385
CY2013Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.375
CY2013Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2014Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2014Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2013Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2013Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	83661969	shares
CY2014Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	84157220	shares
CY2013Q3	us-gaap	Common Stock Value CommonStockValue	83662000	USD
CY2014Q3	us-gaap	Common Stock Value CommonStockValue	84157000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	314668000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	168756000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	339787000	USD
CY2013	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	9274000	USD
CY2014	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	-4946000	USD
CY2014	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	7884000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-8000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5503000	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	12620000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6412000	USD
CY2012	us-gaap	Cost Of Purchased Oil And Gas CostOfPurchasedOilAndGas	415589000	USD
CY2013	us-gaap	Cost Of Purchased Oil And Gas CostOfPurchasedOilAndGas	460432000	USD
CY2014	us-gaap	Cost Of Purchased Oil And Gas CostOfPurchasedOilAndGas	605838000	USD
CY2012	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	698327000	USD
CY2013	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	564432000	USD
CY2014	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	583165000	USD
CY2014	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	18213000	USD
CY2012	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	13095000	USD
CY2013	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	7575000	USD
CY2012	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	13867000	USD
CY2013	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	37546000	USD
CY2012	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	10344000	USD
CY2014	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	490164000	USD
CY2013	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	460554000	USD
CY2012	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	576397000	USD
CY2014	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	71850000	USD
CY2012	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	84624000	USD
CY2013	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	49483000	USD
CY2014Q3	us-gaap	Credit Risk Derivative Assets At Fair Value CreditRiskDerivativeAssetsAtFairValue	60100000	USD
CY2014Q3	us-gaap	Credit Risk Derivative Liabilities At Fair Value CreditRiskDerivativeLiabilitiesAtFairValue	100000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-632000	USD
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	34579000	USD
CY2013Q3	us-gaap	Customer Advances Current CustomerAdvancesCurrent	21959000	USD
CY2014Q3	us-gaap	Customer Advances Current CustomerAdvancesCurrent	19005000	USD
CY2014Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	15761000	USD
CY2013Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	16183000	USD
CY2014Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1649000000	USD
CY2013Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1649000000	USD
CY2014	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	142415000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	32974000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1504187000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1614515000	USD
CY2013Q3	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax	300000	USD
CY2014Q3	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax	200000	USD
CY2013Q3	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	1767519000	USD
CY2014Q3	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	1775715000	USD
CY2014Q3	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	2740000000	USD
CY2014	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	-691000	USD
CY2013	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	0	USD
CY2012	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	0	USD
CY2013Q3	us-gaap	Deferred Costs DeferredCosts	9382000	USD
CY2014Q3	us-gaap	Deferred Costs DeferredCosts	14212000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	111176000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	116143000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	130318000	USD
CY2013	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	167887000	USD
CY2012	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	144150000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	37569000	USD
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	26272000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	215262000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	171423000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-1267648000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-1415960000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	435979000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	399738000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	79359000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	40323000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	90461000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	103863000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1703627000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1815698000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	1347007000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	1456283000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	75419000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	87935000	USD
CY2014Q3	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	759000	USD
CY2013Q3	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	639000	USD
CY2014Q3	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	72606000	USD
CY2013Q3	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	48989000	USD
CY2014Q3	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.68
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.14
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.03
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2013Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.70
CY2013Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.98
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.52
CY2014Q3	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	36512000	USD
CY2013Q3	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	22774000	USD
CY2014	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	44600000	USD
CY2014	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	2800000	USD
CY2014	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	53000000	USD
CY2014	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	3300000	USD
CY2014Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	326200000	USD
CY2014Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	59400000	USD
CY2014Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	62900000	USD
CY2014Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	62200000	USD
CY2014Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	61300000	USD
CY2014Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	60400000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	271530000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	326760000	USD
CY2014	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	383781000	USD
CY2013	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	36029000	USD
CY2014	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-17647000	USD
CY2013	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	-2045000	USD
CY2014	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	624000	USD
CY2012	us-gaap	Development Costs DevelopmentCosts	1405000	USD
CY2013	us-gaap	Development Costs DevelopmentCosts	677000	USD
CY2014	us-gaap	Development Costs DevelopmentCosts	39339000	USD
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	123668000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	119815000	USD
CY2014	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	127669000	USD
CY2013Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	31373000	USD
CY2014Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	32400000	USD
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.65
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.11
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.57
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.08
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.63
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.12
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.76
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.81
CY2013Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.68
CY2013Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.02
CY2012	us-gaap	Effect On Future Cash Flows Amount EffectOnFutureCashFlowsAmount	128400000	USD
CY2013	us-gaap	Effect On Future Cash Flows Amount EffectOnFutureCashFlowsAmount	71600000	USD
CY2014	us-gaap	Effect On Future Cash Flows Amount EffectOnFutureCashFlowsAmount	-33600000	USD
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2013	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	100000	USD
CY2014	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	100000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4300000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4600000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2900000	USD
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	3100000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	3600000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	14200000	USD
CY2013Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	51484000	USD
CY2014Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	39422000	USD
CY2013	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	675000	USD
CY2012	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	985000	USD
CY2014	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	4641000	USD
CY2014	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	4641000	USD
CY2013	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	675000	USD
CY2012	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	985000	USD
CY2012	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2013	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2014	us-gaap	Exploration Costs ExplorationCosts	36882000	USD
CY2012	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	224474000	USD
CY2014	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	381008000	USD
CY2013	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	390255000	USD
CY2014Q3	us-gaap	Fair Value Assets Level1 To Level2 Transfers Amount FairValueAssetsLevel1ToLevel2TransfersAmount	0	USD
CY2013Q3	us-gaap	Fair Value Assets Level1 To Level2 Transfers Amount FairValueAssetsLevel1ToLevel2TransfersAmount	0	USD
CY2014Q3	us-gaap	Goodwill Goodwill	5476000	USD
CY2014	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
CY2013	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
CY2013Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	8943942000	USD
CY2012Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	7373129000	USD
CY2014Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	10001545000	USD
CY2012Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	619573000	USD
CY2013Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	749876000	USD
CY2014Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	790033000	USD
CY2013Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	2113101000	USD
CY2012Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	1812055000	USD
CY2014Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	2434370000	USD
CY2014Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	3981485000	USD
CY2013Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	3746572000	USD
CY2012Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	3021971000	USD
CY2014Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	2795657000	USD
CY2013Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	2334393000	USD
CY2012Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	1919530000	USD
CY2014Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	1914607000	USD
CY2013Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	1780206000	USD
CY2012Q3	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	1552180000	USD
CY2014	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	122000	USD
CY2013Q3	us-gaap	Goodwill Goodwill	5476000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	432759000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	489027000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	370631000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	189614000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	150554000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	172758000	USD
CY2013	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-130574000	USD
CY2012	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-19280000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-5405000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	3016000	USD
CY2014	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-13285000	USD
CY2013	us-gaap	Increase Decrease In Customer Advances IncreaseDecreaseInCustomerAdvances	-2096000	USD
CY2012	us-gaap	Increase Decrease In Customer Advances IncreaseDecreaseInCustomerAdvances	4412000	USD
CY2013	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	-1759000	USD
CY2012	us-gaap	Increase Decrease In Margin Deposits Outstanding IncreaseDecreaseInMarginDepositsOutstanding	-19337000	USD
CY2013	us-gaap	Income Tax Reconciliation Deductions Other IncomeTaxReconciliationDeductionsOther	6982000	USD
CY2014	us-gaap	Income Tax Reconciliation Deductions Other IncomeTaxReconciliationDeductionsOther	7108000	USD
CY2012	us-gaap	Income Tax Reconciliation Deductions Other IncomeTaxReconciliationDeductionsOther	5146000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	129518000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	171008000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	151317000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	27997000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	25601000	USD
CY2014	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	25280000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	474000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	40944000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	13187000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	15149000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	8303000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-16773000	USD
CY2013	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	666000	USD
CY2014	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	6872000	USD
CY2012	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	10633000	USD
CY2014	us-gaap	Increase Decrease In Customer Advances IncreaseDecreaseInCustomerAdvances	-2954000	USD
CY2014	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	-422000	USD
CY2012	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	621000	USD
CY2014	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	-12408000	USD
CY2013	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	12408000	USD
CY2012	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	0	USD
CY2013	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	6117000	USD
CY2012	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	29627000	USD
CY2014	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	68731000	USD
CY2014	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-231807000	USD
CY2014	us-gaap	Increase Decrease In Margin Deposits Outstanding IncreaseDecreaseInMarginDepositsOutstanding	1640000	USD
CY2013	us-gaap	Increase Decrease In Margin Deposits Outstanding IncreaseDecreaseInMarginDepositsOutstanding	730000	USD
CY2012	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-9790000	USD
CY2013	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	109000	USD
CY2014	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	3630000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-18513000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4396000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5757000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	6879000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-1635000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-14375000	USD
CY2012	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-13859000	USD
CY2013	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	17135000	USD
CY2014	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	22781000	USD
CY2013	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	-7136000	USD
CY2012	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	4445000	USD
CY2014	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	20917000	USD
CY2012	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2014	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	34705000	USD
CY2013	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2014	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	763000	USD
CY2013	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	0	USD
CY2012	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	0	USD
CY2012	us-gaap	Interest Expense InterestExpense	86240000	USD
CY2013	us-gaap	Interest Expense InterestExpense	94111000	USD
CY2014	us-gaap	Interest Expense InterestExpense	94277000	USD
CY2013	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	90273000	USD
CY2012	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	82002000	USD
CY2014	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	90194000	USD
CY2013	us-gaap	Interest Expense Other InterestExpenseOther	3838000	USD
CY2014	us-gaap	Interest Expense Other InterestExpenseOther	4083000	USD
CY2012	us-gaap	Interest Expense Other InterestExpenseOther	4238000	USD
CY2012	us-gaap	Interest Income Domestic Deposits InterestIncomeDomesticDeposits	3689000	USD
CY2014	us-gaap	Interest Income Domestic Deposits InterestIncomeDomesticDeposits	4170000	USD
CY2013	us-gaap	Interest Income Domestic Deposits InterestIncomeDomesticDeposits	4335000	USD
CY2013	us-gaap	Interest Paid InterestPaid	91215000	USD
CY2012	us-gaap	Interest Paid InterestPaid	79820000	USD
CY2014	us-gaap	Interest Paid InterestPaid	91927000	USD
CY2013Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	29904000	USD
CY2014Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	27817000	USD
CY2013	us-gaap	Investment Tax Credit InvestmentTaxCredit	-426000	USD
CY2012	us-gaap	Investment Tax Credit InvestmentTaxCredit	-581000	USD
CY2014	us-gaap	Investment Tax Credit InvestmentTaxCredit	-434000	USD
CY2013Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6218347000	USD
CY2014Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6739597000	USD
CY2014Q3	us-gaap	Liabilities Current LiabilitiesCurrent	490576000	USD
CY2013Q3	us-gaap	Liabilities Current LiabilitiesCurrent	302171000	USD
CY2013Q3	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	2072447000	USD
CY2014Q3	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	2189338000	USD
CY2014Q3	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2014	us-gaap	Line Of Credit Facility Expiration Date1 LineOfCreditFacilityExpirationDate1	2017-01-06
CY2014Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	750000000.0	USD
CY2014Q3	us-gaap	Long Term Debt LongTermDebt	1649000000	USD
CY2013Q3	us-gaap	Long Term Debt LongTermDebt	1649000000	USD
CY2013Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2014Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1099000000	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	250000000	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	300000000	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2014Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1649000000	USD
CY2013Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1649000000	USD
CY2014Q3	us-gaap	Loss Contingency Range Of Possible Loss Minimum LossContingencyRangeOfPossibleLossMinimum	14000000	USD
CY2014Q3	us-gaap	Margin Deposit Assets MarginDepositAssets	2734000	USD
CY2013Q3	us-gaap	Margin Deposit Assets MarginDepositAssets	1094000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	369617000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-28927000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-42225000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-908435000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-705983000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1034561000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	909390000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	738572000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	659010000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	260001000	USD
CY2014	us-gaap	Net Income Loss NetIncomeLoss	299413000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	220077000	USD
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	85720000	USD
CY2013Q2	us-gaap	Net Income Loss NetIncomeLoss	58495000	USD
CY2014Q1	us-gaap	Net Income Loss NetIncomeLoss	95210000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	57431000	USD
CY2013Q3	us-gaap	Net Income Loss NetIncomeLoss	47842000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	67944000	USD
CY2014Q2	us-gaap	Net Income Loss NetIncomeLoss	64520000	USD
CY2013Q4	us-gaap	Net Income Loss NetIncomeLoss	82252000	USD
CY2013	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	339655000	USD
CY2014	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-38723000	USD
CY2012	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-385019000	USD
CY2014	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	5
CY2013	us-gaap	Operating Expenses OperatingExpenses	1311713000	USD
CY2014	us-gaap	Operating Expenses OperatingExpenses	1543408000	USD
CY2012	us-gaap	Operating Expenses OperatingExpenses	1178804000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-9515000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	517838000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	569673000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	448049000	USD
CY2013Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	127004000	USD
CY2014Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	102004000	USD
CY2013Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	162991000	USD
CY2014Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	127013000	USD
CY2013Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	96636000	USD
CY2013Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	160581000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	131207000	USD
CY2014Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	180075000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	16000000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	5300000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	5600000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	5700000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	5800000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	2400000	USD
CY2013Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	83946000	USD
CY2014Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	136672000	USD
CY2014Q3	us-gaap	Other Assets Current OtherAssetsCurrent	54752000	USD
CY2013Q3	us-gaap	Other Assets Current OtherAssetsCurrent	56905000	USD
CY2013Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	2447000	USD
CY2014Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1355000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	1710000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	132024000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-86676000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	27105000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	15255000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	79786000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-51321000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	8280000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	-55940000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	27552000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	-21304000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	2720000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	10144000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	662000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	242000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	65691000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	36029000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-17647000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	22114000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	15282000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	10270000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	9203000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	14799000	USD
CY2014Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2013Q3	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	158014000	USD
CY2014Q3	us-gaap	Prepaid Taxes PrepaidTaxes	13743000	USD
CY2014Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2013Q3	us-gaap	Prepaid Taxes PrepaidTaxes	13079000	USD
CY2013	us-gaap	Previously Estimated Development Costs Incurred During Period PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	148535000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	5650000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	3836000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	3370000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	52238000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-35355000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	11850000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	5334000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-7248000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	91790000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-8244000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	38236000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	529000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	5041000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3863000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3545000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1311000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1398000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1847000	USD
CY2014Q3	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	133908000	USD
CY2013Q3	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	141510000	USD
CY2012	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-5013000	USD
CY2014	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-14063000	USD
CY2013	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-14965000	USD
CY2013	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	4697000	USD
CY2014	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	9461000	USD
CY2012	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	5133000	USD
CY2013Q3	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	10605000	USD
CY2014Q3	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	10079000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2522000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-5982000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-446000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	126642000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	122710000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	118798000	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	703461000	USD
CY2014	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	914417000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1035007000	USD
CY2014Q3	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	134202000	USD
CY2012	us-gaap	Previously Estimated Development Costs Incurred During Period PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	252967000	USD
CY2014	us-gaap	Previously Estimated Development Costs Incurred During Period PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	179502000	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	496085000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	495415000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-171000000	USD
CY2014	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	85600000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	131000000	USD
CY2013	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	5395000	USD
CY2012	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	10345000	USD
CY2014	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	7474000	USD
CY2012	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	977394000	USD
CY2013	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	717097000	USD
CY2014	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	969907000	USD
CY2014Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	8245791000	USD
CY2013Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	7313203000	USD
CY2014Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5743091000	USD
CY2013Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5151726000	USD
CY2014Q3	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	512000000000	ft3
CY2013Q3	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	452000000000	ft3
CY2012Q3	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	410000000000	ft3
CY2013Q3	us-gaap	Receivables Net Current ReceivablesNetCurrent	133182000	USD
CY2014Q3	us-gaap	Receivables Net Current ReceivablesNetCurrent	149735000	USD
CY2014	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-13545000	USD
CY2014Q3	us-gaap	Recorded Unconditional Purchase Obligation Due After Fifth Year RecordedUnconditionalPurchaseObligationDueAfterFifthYear	845100000	USD
CY2014Q3	us-gaap	Recorded Unconditional Purchase Obligation Due In Fifth Year RecordedUnconditionalPurchaseObligationDueInFifthYear	82100000	USD
CY2014Q3	us-gaap	Recorded Unconditional Purchase Obligation Due In Fourth Year RecordedUnconditionalPurchaseObligationDueInFourthYear	91800000	USD
CY2014Q3	us-gaap	Recorded Unconditional Purchase Obligation Due In Second Year RecordedUnconditionalPurchaseObligationDueInSecondYear	66700000	USD
CY2014Q3	us-gaap	Recorded Unconditional Purchase Obligation Due In Third Year RecordedUnconditionalPurchaseObligationDueInThirdYear	91800000	USD
CY2014Q3	us-gaap	Recorded Unconditional Purchase Obligation Due Within One Year RecordedUnconditionalPurchaseObligationDueWithinOneYear	263800000	USD
CY2014Q3	us-gaap	Refundable Gas Costs RefundableGasCosts	33745000	USD
CY2013Q3	us-gaap	Refundable Gas Costs RefundableGasCosts	12828000	USD
CY2014Q3	us-gaap	Regulatory Assets RegulatoryAssets	413387000	USD
CY2013Q3	us-gaap	Regulatory Assets RegulatoryAssets	446194000	USD
CY2014Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	22719000	USD
CY2013Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	26995000	USD
CY2013Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	252568000	USD
CY2014Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	224436000	USD
CY2013Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	337667000	USD
CY2014Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	397904000	USD
CY2014Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	51817000	USD
CY2013Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	32841000	USD
CY2012	us-gaap	Results Of Operations Accretion Of Asset Retirement Obligations ResultsOfOperationsAccretionOfAssetRetirementObligations	3084000	USD
CY2013Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	61549000	USD
CY2014Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	81152000	USD
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	250000000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	150000000	USD
CY2014	us-gaap	Results Of Operations Accretion Of Asset Retirement Obligations ResultsOfOperationsAccretionOfAssetRetirementObligations	6192000	USD
CY2013	us-gaap	Results Of Operations Accretion Of Asset Retirement Obligations ResultsOfOperationsAccretionOfAssetRetirementObligations	3929000	USD
CY2012	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	182759000	USD
CY2013	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	238467000	USD
CY2014	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	291651000	USD
CY2013	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	120431000	USD
CY2012	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	81904000	USD
CY2014	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	140484000	USD
CY2013	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	163803000	USD
CY2012	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	113834000	USD
CY2014	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	188633000	USD
CY2012	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	83361000	USD
CY2014	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	165534000	USD
CY2013	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	119243000	USD
CY2014	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	813259000	USD
CY2012	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	488562000	USD
CY2013	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	663073000	USD
CY2012	us-gaap	Results Of Operations Sales Or Transfers To Entitys Other Operations ResultsOfOperationsSalesOrTransfersToEntitysOtherOperations	0	USD
CY2013	us-gaap	Results Of Operations Sales Or Transfers To Entitys Other Operations ResultsOfOperationsSalesOrTransfersToEntitysOtherOperations	612000	USD
CY2014	us-gaap	Results Of Operations Sales Or Transfers To Entitys Other Operations ResultsOfOperationsSalesOrTransfersToEntitysOtherOperations	2145000	USD
CY2012	us-gaap	Results Of Operations Sales Revenue To Unaffiliated Enterprises ResultsOfOperationsSalesRevenueToUnaffiliatedEnterprises	1000	USD
CY2014	us-gaap	Results Of Operations Sales Revenue To Unaffiliated Enterprises ResultsOfOperationsSalesRevenueToUnaffiliatedEnterprises	1000	USD
CY2013	us-gaap	Results Of Operations Sales Revenue To Unaffiliated Enterprises ResultsOfOperationsSalesRevenueToUnaffiliatedEnterprises	1000	USD
CY2011Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1206022000	USD
CY2012Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1306284000	USD
CY2013Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1442617000	USD
CY2014Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1614361000	USD
CY2013	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	34864000	USD
CY2014	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	55184000	USD
CY2012	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	103472000	USD
CY2013	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	-526630000	USD
CY2012	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	-381581000	USD
CY2014	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	-626960000	USD
CY2014	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	2113081000	USD
CY2013	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	1829551000	USD
CY2012	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	1626853000	USD
CY2013Q1	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	597826000	USD
CY2013Q2	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	440008000	USD
CY2012Q4	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	452854000	USD
CY2013Q4	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	550072000	USD
CY2014Q3	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	366623000	USD
CY2014Q2	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	440144000	USD
CY2014Q1	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	756242000	USD
CY2013Q3	us-gaap	Sales Revenue Goods Gross SalesRevenueGoodsGross	338863000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	11763000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	12446000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	7939000	USD
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	712232	shares
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	482000	shares
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	36.71
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	16039000	USD
CY2013Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	803500	shares
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	482000	shares
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	36.71
CY2013Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	34.71
CY2014	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	31.71
CY2014	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0.00
CY2014	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2014Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	16039000	USD
CY2014	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P1Y9M20D
CY2014	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P1Y9M20D
CY2013Q3	us-gaap	Short Term Bank Loans And Notes Payable ShortTermBankLoansAndNotesPayable	0	USD
CY2014Q3	us-gaap	Short Term Bank Loans And Notes Payable ShortTermBankLoansAndNotesPayable	0	USD
CY2014Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	85600000	USD
CY2013Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	0	USD
CY2013Q3	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1966366000	USD
CY2014Q3	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2066878000	USD
CY2011Q3	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1524157000	USD
CY2012Q3	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1469791000	USD
CY2014	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	93731	shares
CY2014	us-gaap	Stock Issued During Period Shares Employee Benefit Plan StockIssuedDuringPeriodSharesEmployeeBenefitPlan	69729	shares
CY2014	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	-321500	shares
CY2014	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	126321	shares
CY2014Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2410683000	USD
CY2013Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2194729000	USD
CY2014Q3	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	36000000	USD
CY2012	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	90288000	USD
CY2013	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	82431000	USD
CY2014	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	90711000	USD
CY2014	us-gaap	Unrealized Gain Loss On Price Risk Cash Flow Derivatives Before Tax UnrealizedGainLossOnPriceRiskCashFlowDerivativesBeforeTax	76100000	USD
CY2012Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11170000	USD
CY2014Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3147000	USD
CY2013Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2001000	USD
CY2011Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	7766000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	947000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1301000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	10033000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1600000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	700000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2447000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2751000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	164000	USD
CY2013Q3	us-gaap	Unrecovered Costs For Purchased Gas Amount UnrecoveredCostsForPurchasedGasAmount	12408000	USD
CY2014Q3	us-gaap	Unrecovered Costs For Purchased Gas Amount UnrecoveredCostsForPurchasedGasAmount	0	USD
CY2012	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	401397000	USD
CY2013	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	442090000	USD
CY2014	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	463078000	USD
CY2011Q3	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	31039000	USD
CY2013Q3	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	27144000	USD
CY2012Q3	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	30317000	USD
CY2014Q3	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	31811000	USD
CY2012	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	9183000	USD
CY2013	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	5568000	USD
CY2014	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	10856000	USD
CY2012	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	1946000	USD
CY2014	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	3241000	USD
CY2013	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	2390000	USD
CY2012	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	11851000	USD
CY2014	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	9430000	USD
CY2013	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	11131000	USD
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	83739771	shares
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	84952347	shares
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	84341220	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83127844	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83929989	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83518857	shares
CY2012	nfg	Costs Incurred Exploration Costs Capitalized Interest CostsIncurredExplorationCostsCapitalizedInterest	1000000	USD
CY2013	nfg	Costs Incurred Exploration Costs Capitalized Interest CostsIncurredExplorationCostsCapitalizedInterest	400000	USD
CY2014	nfg	After Tax Net Hedging Gains Losses In Accumulated Other Comprehensive Income Loss AfterTaxNetHedgingGainsLossesInAccumulatedOtherComprehensiveIncomeLoss	43700000	USD
CY2014	nfg	Costs Incurred Development Costs Capitalized Interest CostsIncurredDevelopmentCostsCapitalizedInterest	700000	USD
CY2012	nfg	Costs Incurred Development Costs Capitalized Interest CostsIncurredDevelopmentCostsCapitalizedInterest	2000000	USD
CY2014	nfg	Allowed Rate Of Return On Equity AllowedRateOfReturnOnEquity	0.091
CY2014	nfg	Amortization Period AmortizationPeriod	P10Y
CY2013	nfg	Amount Spent For Developing Proved Undeveloped Reserves AmountSpentForDevelopingProvedUndevelopedReserves	148500000	USD
CY2014	nfg	Amount Spent For Developing Proved Undeveloped Reserves AmountSpentForDevelopingProvedUndevelopedReserves	179900000	USD
CY2012	nfg	Amount Spent For Developing Proved Undeveloped Reserves AmountSpentForDevelopingProvedUndevelopedReserves	216600000	USD
CY2014	nfg	Amount Which Could Trigger Repayment Obligation Under Committed Credit Facility AmountWhichCouldTriggerRepaymentObligationUnderCommittedCreditFacility	40000000	USD
CY2014	nfg	Annual Discount For Estimated Timing Of Cash Flows AnnualDiscountForEstimatedTimingOfCashFlows	0.10
CY2013	nfg	Asset Retirement Obligation Liabilities Incurred And Revisions Of Estimates AssetRetirementObligationLiabilitiesIncurredAndRevisionsOfEstimates	-4796000	USD
CY2012	nfg	Asset Retirement Obligation Liabilities Incurred And Revisions Of Estimates AssetRetirementObligationLiabilitiesIncurredAndRevisionsOfEstimates	41653000	USD
CY2014	nfg	Asset Retirement Obligation Liabilities Incurred And Revisions Of Estimates AssetRetirementObligationLiabilitiesIncurredAndRevisionsOfEstimates	-2496000	USD
CY2014	nfg	Assumed12 Month Basis Differential Comparison To Nymex Assumed12MonthBasisDifferentialComparisonToNymex	0.982
CY2014Q3	nfg	Assumed Twelve Month Basis Differential Comparison To Nymex Maximum AssumedTwelveMonthBasisDifferentialComparisonToNymexMaximum	1.006
CY2014Q3	nfg	Assumed Twelve Month Basis Differential Comparison To Nymex Minimum AssumedTwelveMonthBasisDifferentialComparisonToNymexMinimum	0.953
CY2014	nfg	Authorized Increase In Pipeline Replacement Spending Per Year AuthorizedIncreaseInPipelineReplacementSpendingPerYear	8200000	USD
CY2014	nfg	Beginning Retained Earnings Unappropriated And Current Period Net Income Loss BeginningRetainedEarningsUnappropriatedAndCurrentPeriodNetIncomeLoss	1742030000	USD
CY2012	nfg	Beginning Retained Earnings Unappropriated And Current Period Net Income Loss BeginningRetainedEarningsUnappropriatedAndCurrentPeriodNetIncomeLoss	1426099000	USD
CY2013	nfg	Beginning Retained Earnings Unappropriated And Current Period Net Income Loss BeginningRetainedEarningsUnappropriatedAndCurrentPeriodNetIncomeLoss	1566285000	USD
CY2014	nfg	Capital Expenditures Related To Proved Undeveloped Reserves CapitalExpendituresRelatedToProvedUndevelopedReserves	180000000	USD
CY2013	nfg	Capital Expenditures Related To Proved Undeveloped Reserves CapitalExpendituresRelatedToProvedUndevelopedReserves	149000000	USD
CY2014	nfg	Cash Flow Hedge Gain Loss To Be Reclassified After Twelve Months CashFlowHedgeGainLossToBeReclassifiedAfterTwelveMonths	35000000	USD
CY2014	nfg	Cash Flow Hedge Gain Loss To Be Reclassified After Twelve Months After Tax CashFlowHedgeGainLossToBeReclassifiedAfterTwelveMonthsAfterTax	20100000	USD
CY2014	nfg	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months After Tax CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsAfterTax	23600000	USD
CY2014	nfg	Committed Credit Facility Debt To Capitalization Ratio CommittedCreditFacilityDebtToCapitalizationRatio	0.65
CY2014	nfg	Conversion Of Undeveloped Proved Reserves To Developed Proved Reserves Volume ConversionOfUndevelopedProvedReservesToDevelopedProvedReservesVolume	229000000000	ft3
CY2013	nfg	Conversion Of Undeveloped Proved Reserves To Developed Proved Reserves Volume ConversionOfUndevelopedProvedReservesToDevelopedProvedReservesVolume	160000000000	ft3
CY2013Q3	nfg	Cost Of Removal Regulatory Liability CostOfRemovalRegulatoryLiability	157622000	USD
CY2014Q3	nfg	Cost Of Removal Regulatory Liability CostOfRemovalRegulatoryLiability	173199000	USD
CY2013	nfg	Costs Incurred Development Costs Capitalized Interest CostsIncurredDevelopmentCostsCapitalizedInterest	700000	USD
CY2014	nfg	Costs Incurred Exploration Costs Capitalized Interest CostsIncurredExplorationCostsCapitalizedInterest	700000	USD
CY2014	nfg	Debt Instrument Principal Outstanding Portion Of Long Term Debt DebtInstrumentPrincipalOutstandingPortionOfLongTermDebt	0.060
CY2014	nfg	Debt To Capitalization Ratio DebtToCapitalizationRatio	0.42
CY2014Q3	nfg	Deferred Tax Assets Pension And Other Post Retirement Costs DeferredTaxAssetsPensionAndOtherPostRetirementCosts	124452000	USD
CY2013Q3	nfg	Deferred Tax Assets Pension And Other Post Retirement Costs DeferredTaxAssetsPensionAndOtherPostRetirementCosts	130256000	USD
CY2013Q3	nfg	Deferred Tax Liabilities Pension And Other Post Retirement Costs DeferredTaxLiabilitiesPensionAndOtherPostRetirementCosts	124021000	USD
CY2014Q3	nfg	Deferred Tax Liabilities Pension And Other Post Retirement Costs DeferredTaxLiabilitiesPensionAndOtherPostRetirementCosts	113248000	USD
CY2014	nfg	Defined Benefit Plan Anticipated Ultimate Health Care Trend Rate After Ten Years DefinedBenefitPlanAnticipatedUltimateHealthCareTrendRateAfterTenYears	0.045
CY2013Q3	nfg	Depreciable Plant Assets DepreciablePlantAssets	7006331000	USD
CY2014Q3	nfg	Depreciable Plant Assets DepreciablePlantAssets	7791390000	USD
CY2012	nfg	Depreciation Depletion And Amortization Per Mcfe Of Production DepreciationDepletionAndAmortizationPerMcfeOfProduction	2.19	USD
CY2014	nfg	Depreciation Depletion And Amortization Per Mcfe Of Production DepreciationDepletionAndAmortizationPerMcfeOfProduction	1.82	USD
CY2013	nfg	Depreciation Depletion And Amortization Per Mcfe Of Production DepreciationDepletionAndAmortizationPerMcfeOfProduction	1.98	USD
CY2014Q3	nfg	Earnings Reinvested In Business Available For Dividends EarningsReinvestedInBusinessAvailableForDividends	1500000000	USD
CY2012	nfg	Elimination Of Other Post Retirement Regulatory Liability EliminationOfOtherPostRetirementRegulatoryLiability	-21672000	USD
CY2014	nfg	Elimination Of Other Post Retirement Regulatory Liability EliminationOfOtherPostRetirementRegulatoryLiability	0	USD
CY2013	nfg	Elimination Of Other Post Retirement Regulatory Liability EliminationOfOtherPostRetirementRegulatoryLiability	0	USD
CY2014Q3	nfg	Employee Service Share Based Compensation Cumulative Tax Benefit Not Realized From Excess Tax Deductions Related To Stock Based Compensation EmployeeServiceShareBasedCompensationCumulativeTaxBenefitNotRealizedFromExcessTaxDeductionsRelatedToStockBasedCompensation	34200000	USD
CY2013Q3	nfg	Employee Service Share Based Compensation Cumulative Tax Benefit Not Realized From Excess Tax Deductions Related To Stock Based Compensation EmployeeServiceShareBasedCompensationCumulativeTaxBenefitNotRealizedFromExcessTaxDeductionsRelatedToStockBasedCompensation	34200000	USD
CY2013	nfg	Employee Service Share Based Compensation Tax Benefit Recorded From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRecordedFromExerciseOfStockOptions	700000	USD
CY2014	nfg	Employee Service Share Based Compensation Tax Benefit Recorded From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRecordedFromExerciseOfStockOptions	4600000	USD
CY2012	nfg	Employee Service Share Based Compensation Tax Benefit Recorded From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRecordedFromExerciseOfStockOptions	1000000	USD
CY2012	nfg	Estimated Gross Other Post Retirement Benefit Payments Annual Rate Of Increase In Per Capita Cost Of Covered Prescription Drug Benefits EstimatedGrossOtherPostRetirementBenefitPaymentsAnnualRateOfIncreaseInPerCapitaCostOfCoveredPrescriptionDrugBenefits	0.0808
CY2014	nfg	Estimated Gross Other Post Retirement Benefit Payments Annual Rate Of Increase In Per Capita Cost Of Covered Prescription Drug Benefits EstimatedGrossOtherPostRetirementBenefitPaymentsAnnualRateOfIncreaseInPerCapitaCostOfCoveredPrescriptionDrugBenefits	0.0747
CY2013	nfg	Estimated Gross Other Post Retirement Benefit Payments Annual Rate Of Increase In Per Capita Cost Of Covered Prescription Drug Benefits EstimatedGrossOtherPostRetirementBenefitPaymentsAnnualRateOfIncreaseInPerCapitaCostOfCoveredPrescriptionDrugBenefits	0.0778
CY2013	nfg	Estimated Gross Other Post Retirement Benefit Payments Annual Rate Of Increase In Per Capita Medicare Part B Reimbursement EstimatedGrossOtherPostRetirementBenefitPaymentsAnnualRateOfIncreaseInPerCapitaMedicarePartBReimbursement	0.0678
CY2014	nfg	Estimated Gross Other Post Retirement Benefit Payments Annual Rate Of Increase In Per Capita Medicare Part B Reimbursement EstimatedGrossOtherPostRetirementBenefitPaymentsAnnualRateOfIncreaseInPerCapitaMedicarePartBReimbursement	0.0673
CY2012	nfg	Estimated Gross Other Post Retirement Benefit Payments Annual Rate Of Increase In Per Capita Medicare Part B Reimbursement EstimatedGrossOtherPostRetirementBenefitPaymentsAnnualRateOfIncreaseInPerCapitaMedicarePartBReimbursement	0.0684
CY2013	nfg	Estimated Gross Other Post Retirement Benefit Payments Annual Rate Of Increase In Per Capita Medicare Part D Subsidy EstimatedGrossOtherPostRetirementBenefitPaymentsAnnualRateOfIncreaseInPerCapitaMedicarePartDSubsidy	0.0703
CY2014	nfg	Estimated Gross Other Post Retirement Benefit Payments Annual Rate Of Increase In Per Capita Medicare Part D Subsidy EstimatedGrossOtherPostRetirementBenefitPaymentsAnnualRateOfIncreaseInPerCapitaMedicarePartDSubsidy	0.0679
CY2012	nfg	Estimated Gross Other Post Retirement Benefit Payments Annual Rate Of Increase In Per Capita Medicare Part D Subsidy EstimatedGrossOtherPostRetirementBenefitPaymentsAnnualRateOfIncreaseInPerCapitaMedicarePartDSubsidy	0.0713
CY2013	nfg	Estimated Gross Other Post Retirement Benefit Payments Rate Of Increase For Post Age Sixty Five Participants EstimatedGrossOtherPostRetirementBenefitPaymentsRateOfIncreaseForPostAgeSixtyFiveParticipants	0.0678
CY2014	nfg	Estimated Gross Other Post Retirement Benefit Payments Rate Of Increase For Post Age Sixty Five Participants EstimatedGrossOtherPostRetirementBenefitPaymentsRateOfIncreaseForPostAgeSixtyFiveParticipants	0.0673
CY2012	nfg	Estimated Gross Other Post Retirement Benefit Payments Rate Of Increase For Post Age Sixty Five Participants EstimatedGrossOtherPostRetirementBenefitPaymentsRateOfIncreaseForPostAgeSixtyFiveParticipants	0.0684
CY2012	nfg	Estimated Gross Other Post Retirement Benefit Payments Rate Of Increase For Pre Age Sixty Five Participants EstimatedGrossOtherPostRetirementBenefitPaymentsRateOfIncreaseForPreAgeSixtyFiveParticipants	0.0746
CY2013	nfg	Estimated Gross Other Post Retirement Benefit Payments Rate Of Increase For Pre Age Sixty Five Participants EstimatedGrossOtherPostRetirementBenefitPaymentsRateOfIncreaseForPreAgeSixtyFiveParticipants	0.0728
CY2014	nfg	Estimated Gross Other Post Retirement Benefit Payments Rate Of Increase For Pre Age Sixty Five Participants EstimatedGrossOtherPostRetirementBenefitPaymentsRateOfIncreaseForPreAgeSixtyFiveParticipants	0.0710
CY2014Q3	nfg	Fair Value Assets Liabilities Measured On Recurring Basis Net FairValueAssetsLiabilitiesMeasuredOnRecurringBasisNet	140790000	USD
CY2013Q3	nfg	Fair Value Assets Liabilities Measured On Recurring Basis Net FairValueAssetsLiabilitiesMeasuredOnRecurringBasisNet	139452000	USD
CY2014Q3	nfg	Fair Value Assets Measured On Recurring Basis Total FairValueAssetsMeasuredOnRecurringBasisTotal	141549000	USD
CY2013Q3	nfg	Fair Value Assets Measured On Recurring Basis Total FairValueAssetsMeasuredOnRecurringBasisTotal	140091000	USD
CY2014Q3	nfg	Fair Value Liabilities Measured On Recurring Basis Total FairValueLiabilitiesMeasuredOnRecurringBasisTotal	759000	USD
CY2013Q3	nfg	Fair Value Liabilities Measured On Recurring Basis Total FairValueLiabilitiesMeasuredOnRecurringBasisTotal	639000	USD
CY2014Q3	nfg	Full Cost Ceiling Exceeds Book Value Of Oil And Gas Properties FullCostCeilingExceedsBookValueOfOilAndGasProperties	148400000	USD
CY2014Q3	nfg	Full Cost Ceiling Test Discount Factor FullCostCeilingTestDiscountFactor	0.10
CY2013	nfg	Income From Continuing Operations Before Income Taxes IncomeFromContinuingOperationsBeforeIncomeTaxes	432333000	USD
CY2012	nfg	Income From Continuing Operations Before Income Taxes IncomeFromContinuingOperationsBeforeIncomeTaxes	370050000	USD
CY2014	nfg	Income From Continuing Operations Before Income Taxes IncomeFromContinuingOperationsBeforeIncomeTaxes	488593000	USD
CY2012	nfg	Income Tax Expense Benefit Including Deferred Investment Tax Credit IncomeTaxExpenseBenefitIncludingDeferredInvestmentTaxCredit	149973000	USD
CY2014	nfg	Income Tax Expense Benefit Including Deferred Investment Tax Credit IncomeTaxExpenseBenefitIncludingDeferredInvestmentTaxCredit	189180000	USD
CY2013	nfg	Income Tax Expense Benefit Including Deferred Investment Tax Credit IncomeTaxExpenseBenefitIncludingDeferredInvestmentTaxCredit	172332000	USD
CY2013Q3	nfg	Interest Payable On Long Term Debt InterestPayableOnLongTermDebt	29960000	USD
CY2014Q3	nfg	Interest Payable On Long Term Debt InterestPayableOnLongTermDebt	29960000	USD
CY2014	nfg	Maximum Debt Increase Under Existing Indenture Covenants MaximumDebtIncreaseUnderExistingIndentureCovenants	1920000000	USD
CY2014Q3	nfg	Number Of Counterparties In Net Gain Position NumberOfCounterpartiesInNetGainPosition	14
CY2014Q3	nfg	Number Of Counterparties In Which Company Holds Over Counter Swap Positions NumberOfCounterpartiesInWhichCompanyHoldsOverCounterSwapPositions	16
CY2014	nfg	Number Of Registered Shareholders Of Common Stock NumberOfRegisteredShareholdersOfCommonStock	12654
CY2014	nfg	Offsetting Gain Loss On Hedged Item Attributable To Hedged Risk OffsettingGainLossOnHedgedItemAttributableToHedgedRisk	-122000	USD
CY2014Q3	nfg	Operating Loss Carryforwards Annual Limitations OperatingLossCarryforwardsAnnualLimitations	10000000	USD
CY2014Q3	nfg	Operating Loss Carryforwards Excess Tax Deductions Related To Stock Based Compensation OperatingLossCarryforwardsExcessTaxDeductionsRelatedToStockBasedCompensation	87000000	USD
CY2014Q3	nfg	Other Current Assets Fair Values Of Firm Commitments OtherCurrentAssetsFairValuesOfFirmCommitments	0	USD
CY2013Q3	nfg	Other Current Assets Fair Values Of Firm Commitments OtherCurrentAssetsFairValuesOfFirmCommitments	1829000	USD
CY2014Q3	nfg	Other Investments Including Csv Life Insurance And Avail For Sale OtherInvestmentsIncludingCsvLifeInsuranceAndAvailForSale	86788000	USD
CY2013Q3	nfg	Other Investments Including Csv Life Insurance And Avail For Sale OtherInvestmentsIncludingCsvLifeInsuranceAndAvailForSale	96308000	USD
CY2014Q3	nfg	Percentage Of Assets Or Earning Power That Are Sold Or Transferred PercentageOfAssetsOrEarningPowerThatAreSoldOrTransferred	0.50
CY2014	nfg	Percentage Of Voting Power To Redeem Rights PercentageOfVotingPowerToRedeemRights	0.75
CY2014	nfg	Percentageof Voting Power PercentageofVotingPower	0.10
CY2014Q3	nfg	Proved Undeveloped Reserves Acquired ProvedUndevelopedReservesAcquired	20000000000	ft3
CY2013Q3	nfg	Proved Undeveloped Reserves Additions ProvedUndevelopedReservesAdditions	221000000000	ft3
CY2014Q3	nfg	Proved Undeveloped Reserves Additions ProvedUndevelopedReservesAdditions	290000000000	ft3
CY2013	nfg	Proved Undeveloped Reserves As Percentage Of Total Proved Reserves ProvedUndevelopedReservesAsPercentageOfTotalProvedReserves	0.29
CY2014	nfg	Proved Undeveloped Reserves As Percentage Of Total Proved Reserves ProvedUndevelopedReservesAsPercentageOfTotalProvedReserves	0.27
CY2012	nfg	Proved Undeveloped Reserves As Percentage Of Total Proved Reserves ProvedUndevelopedReservesAsPercentageOfTotalProvedReserves	0.33
CY2014Q3	nfg	Proved Undeveloped Reserves Conversions To Developed Reserves ProvedUndevelopedReservesConversionsToDevelopedReserves	229000000000	ft3
CY2013Q3	nfg	Proved Undeveloped Reserves Conversions To Developed Reserves ProvedUndevelopedReservesConversionsToDevelopedReserves	160000000000	ft3
CY2014Q3	nfg	Proved Undeveloped Reserves Increase ProvedUndevelopedReservesIncrease	60000000000	ft3
CY2013Q3	nfg	Proved Undeveloped Reserves Increase ProvedUndevelopedReservesIncrease	42000000000	ft3
CY2011Q3	nfg	Proved Undeveloped Reserves Percentage ProvedUndevelopedReservesPercentage	0.33
CY2009Q3	nfg	Proved Undeveloped Reserves Percentage ProvedUndevelopedReservesPercentage	0.19
CY2012Q3	nfg	Proved Undeveloped Reserves Percentage ProvedUndevelopedReservesPercentage	0.39
CY2013Q3	nfg	Proved Undeveloped Reserves Percentage ProvedUndevelopedReservesPercentage	0.51
CY2010Q3	nfg	Proved Undeveloped Reserves Percentage ProvedUndevelopedReservesPercentage	0.47
CY2014Q3	nfg	Proved Undeveloped Reserves Removed ProvedUndevelopedReservesRemoved	33000000000	ft3
CY2014Q3	nfg	Proved Undeveloped Reserves Revisions ProvedUndevelopedReservesRevisions	-12000000000	ft3
CY2013Q3	nfg	Proved Undeveloped Reserves Revisions ProvedUndevelopedReservesRevisions	19000000000	ft3
CY2013Q3	nfg	Rate Proceeding Refund Provision Pre Tax RateProceedingRefundProvisionPreTax	7500000	USD
CY2014Q3	nfg	Recoverable Future Taxes RecoverableFutureTaxes	163485000	USD
CY2013Q3	nfg	Recoverable Future Taxes RecoverableFutureTaxes	163355000	USD
CY2014	nfg	Redemption Price For Shareholder Rights Under Shareholder Rights Plan RedemptionPriceForShareholderRightsUnderShareholderRightsPlan	0.01
CY2014	nfg	Results Of Operations Franchise Or Ad Valorem Taxes ResultsOfOperationsFranchiseOrAdValoremTaxes	20765000	USD
CY2012	nfg	Results Of Operations Franchise Or Ad Valorem Taxes ResultsOfOperationsFranchiseOrAdValoremTaxes	23620000	USD
CY2013	nfg	Results Of Operations Franchise Or Ad Valorem Taxes ResultsOfOperationsFranchiseOrAdValoremTaxes	17200000	USD
CY2014	nfg	Shareholder Rights Plan Expiration Date ShareholderRightsPlanExpirationDate	2018-07-31
CY2014Q3	nfg	Taxes Refundable To Customers TaxesRefundableToCustomers	91736000	USD
CY2013Q3	nfg	Taxes Refundable To Customers TaxesRefundableToCustomers	85655000	USD
CY2014Q3	nfg	Unamortized Debt Expense UnamortizedDebtExpense	14304000	USD
CY2013Q3	nfg	Unamortized Debt Expense UnamortizedDebtExpense	16645000	USD
CY2014	dei	Amendment Flag AmendmentFlag	false
CY2014	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2014	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2014	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2014
CY2014	dei	Document Period End Date DocumentPeriodEndDate	2014-09-30
CY2014	dei	Document Type DocumentType	10-K
CY2014	dei	Entity Central Index Key EntityCentralIndexKey	0000070145
CY2014Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	84190266	shares
CY2014	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2014	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2014Q1	dei	Entity Public Float EntityPublicFloat	5688675000	USD
CY2014	dei	Entity Registrant Name EntityRegistrantName	NATIONAL FUEL GAS CO
CY2014	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2014	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0000070145-14-000095-index-headers.html	Edgar Link	pending
0000070145-14-000095-index.html	Edgar Link	pending
0000070145-14-000095.txt	Edgar Link	pending
0000070145-14-000095-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
nfg-20140930.xml	Edgar Link	completed
nfg-20140930.xsd	Edgar Link	pending
nfg-20140930_cal.xml	Edgar Link	unprocessable
nfg-20140930_def.xml	Edgar Link	unprocessable
nfg-20140930_lab.xml	Edgar Link	unprocessable
nfg-20140930_pre.xml	Edgar Link	unprocessable
nfg-2014930x10k.htm	Edgar Link	pending
nfg-2014930_chartx09631.jpg	Edgar Link	pending
nfg-9302014xexhibit12.htm	Edgar Link	pending
nfg-9302014xexhibit21.htm	Edgar Link	pending
nfg-9302014xexhibit231.htm	Edgar Link	pending
nfg-9302014xexhibit232.htm	Edgar Link	pending
nfg-9302014xexhibit311.htm	Edgar Link	pending
nfg-9302014xexhibit312.htm	Edgar Link	pending
nfg-9302014xexhibit32.htm	Edgar Link	pending
nfg-9302014xexhibit991.htm	Edgar Link	pending
nfg9302014exhibit992.htm	Edgar Link	pending
nfg9302014exhibit992001.jpg	Edgar Link	pending
nfg9302014exhibit992002.jpg	Edgar Link	pending
nfg9302014exhibit992003.jpg	Edgar Link	pending
nfg9302014exhibit992004.jpg	Edgar Link	pending
nfg9302014exhibit992005.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$NFG
NATIONAL FUEL GAS CO Stock $nfg

2013 Q3 Form 10-K Financial Statement

#000007014514000095 Filed on November 21, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NFG NATIONAL FUEL GAS CO Stock $nfg

2013 Q3 Form 10-K Financial Statement

#000007014514000095 Filed on November 21, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NFG
NATIONAL FUEL GAS CO Stock $nfg