Derivative Instruments - Gain (Loss) on Derivative Instruments (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Derivative [Line Items] | |||
| Gain due to changes in fair value of derivative instruments | $ 213,679 | $ (174,506) | $ 203,513 |
| Natural gas derivatives | |||
| Derivative [Line Items] | |||
| Gain due to changes in fair value of derivative instruments | 232,143 | (165,933) | 182,993 |
| Oil derivatives | |||
| Derivative [Line Items] | |||
| Gain due to changes in fair value of derivative instruments | (3,350) | (5,387) | 19,201 |
| Natural gas liquids derivatives | |||
| Derivative [Line Items] | |||
| Gain due to changes in fair value of derivative instruments | $ (15,114) | $ (3,186) | $ 1,319 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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