CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income		$ (300,948)	$ 146,418	$ (391,858)	$ 350,328
Other comprehensive income:
De-designated hedges reclassified into natural gas, NGLs and oil sales, net of taxes	[1]	0	(2,172)	0	(6,458)
Total comprehensive (loss) income		$ (300,948)	$ 144,246	$ (391,858)	$ 343,870

[1] Amounts are net of income tax benefit of $1,332 for the three months ended September 30, 2014 and $4,122 for the nine months ended September 30, 2014. As of March 31, 2013, we elected to discontinue hedge accounting prospectively and as of December 31, 2014, all remaining accumulated other comprehensive income (“AOCI”) hedging gains had been transferred to earnings.