CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Realized (gain) loss on hedge derivative contract settlements reclassified into natural gas, NGLs and oil sales from other comprehensive income, tax portion	$ 9,488	$ 91,871	$ 50,005
De-designated hedges reclassified into natural gas, NGLs and oil sales, tax portion	35,968
De-designated hedges reclassified to derivative fair value income, tax portion	1,517
Change in unrealized deferred hedging (losses) gains, tax effect	$ 2,687	$ (47,466)	$ (104,464)

Amount of taxes related to reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments, previously designated and qualifying as the effective portion of cash flow hedges which are now being amortized and reclassified into Natural gas, NGLs and oil sales.

No definition available.

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- Definition

Amount of taxes related to reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated, previously qualifying as cash flow hedges but relate to transactions not probable of occurring.

+ References

No definition available.

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- Definition

Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580

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- Definition

Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

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