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Derivative Instruments and Hedging Activities - Derivative Gain (Loss) Reclassified from AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 01, 2014
Effect of derivative instruments on the Consolidated Statement of Operations |  |  |  |
Gain (loss) related to amounts previously frozen in accumulated OCI, reclassified into income |  |  |  | $ (73,400)
Derivatives Designated as Hedges |  |  |  |
Effect of derivative instruments on the Consolidated Statement of Operations |  |  |  |
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion) | $ 0 | $ 0 | $ (144,203) |
Derivatives Designated as Hedges | Natural gas |  |  |  |
Effect of derivative instruments on the Consolidated Statement of Operations |  |  |  |
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion) | 0 | 0 | (143,577) |
Derivatives Designated as Hedges | Crude oil and condensate |  |  |  |
Effect of derivative instruments on the Consolidated Statement of Operations |  |  |  |
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion) | $ 0 | $ 0 | $ (626) |

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41638-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 + Details
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