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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net income $ 115,722 $ 13,002 $ 58,026
Other comprehensive income:      
Realized (gain) loss on hedge derivative contract settlements reclassified into natural gas, NGLs and oil sales from other comprehensive income, net of taxes (14,840) [1] (144,434) [1] (82,196) [1]
De-designated hedges reclassified into natural gas, NGLs and oil sales, net of taxes (56,254) [2]    
De-designated hedges reclassified to derivative fair value income, net of taxes (2,376) [3]    
Change in unrealized deferred hedging (losses) gains, net of taxes (4,203) [4] 71,716 [4] 171,353 [4]
Total comprehensive income (loss) $ 38,049 $ (59,716) $ 147,183
[1] Amounts are net of income tax benefit of $9,488 for the year ended December 31, 2013 compared to $91,871 for the year ended December 31, 2012 and $50,005 for the year ended December 31, 2011.
[2] Amounts are net of income tax benefit of $35,968 for the year ended December 31, 2013.
[3] Amounts relate to transactions not probable of occurring and are presented net of income tax benefit of $1,517 for the year ended December 31, 2013.
[4] Amounts are net of income tax benefit of $2,687 for the year ended December 31, 2013 compared to income tax expense of $47,466 for the year ended December 31, 2012 and income tax expense of $104,464 for the twelve months ended December 31, 2011.