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Derivatives Derivates Impact on Income (Details) MMcf in Billions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) MMcf | Dec. 31, 2015 USD ($) MMcf | Dec. 31, 2014 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Cash Received on Hedge | $ 245,212,000 | $ 196,348,000 | $ 19,025,000
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | (386,233,000) | 196,594,000 | 4,168,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (43,470,000) |  | (18,288,000)
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion | 0 | 0 | 97,316,000
Accumulated Other Comprehensive Income (Loss), Net of Tax | (392,556,000) | (315,598,000) |
Accumulated Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Roll Forward] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 43,470,000 | 121,521,000 | 42,493,000
Gain (Loss) on Hedging Activity | $ (141,021,000) | $ 392,942,000 | 23,193,000
Commodity Member [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MMcf | 0.0 | 456.1 |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | $ 68,481,000 | $ 123,105,000 | 0
Accumulated Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Roll Forward] |  |  |
Gain (Loss) on Hedging Activity | 68,481,000 | 123,105,000 | 0
ineffectiveness member [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | 0 | 0 | 4,168,000
Accumulated Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Roll Forward] |  |  |
Gain (Loss) on Hedging Activity | 0 | 0 | 4,168,000
Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Cash Received on Hedge | (225,797,000) | (193,976,000) | (19,025,000)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | (520,170,000) | 81,142,000 | 0
Accumulated Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Roll Forward] |  |  |
Gain (Loss) on Hedging Activity | (294,373,000) | 275,118,000 | 19,025,000
Natural Gas Liquids [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Cash Received on Hedge | 650,000 | 0 | 0
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | (1,148,000) | 0 | 0
Accumulated Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Roll Forward] |  |  |
Gain (Loss) on Hedging Activity | (1,798,000) | 0 | 0
Basis Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Cash Received on Hedge | (20,065,000) | (2,372,000) | 0
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | 66,604,000 | (7,653,000) | 0
Accumulated Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Roll Forward] |  |  |
Gain (Loss) on Hedging Activity | $ 86,669,000 | $ (5,281,000) | 0
Basis Member [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MMcf | 482.0 | 124.4 |
Propane [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MMcf | 126.0 | 0.0 |
Natural Gas [Member] | Swap [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ 0 | $ 43,470,000 | 121,521,000
Revenue Mineral Sales [Member] | Natural Gas [Member] | Swap [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ (43,470,000) | $ (78,051,000) | $ (18,288,000)

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