CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income		$ (521,388)	$ (713,685)	$ 634,382
Other comprehensive loss:
De-designated hedges reclassified into natural gas, NGLs and oil sales, net of taxes	[1]	0	0	(6,236)
Total comprehensive (loss) income	[2]	$ (521,388)	$ (713,685)	$ 628,146

[1] Amounts are net of income tax benefit of $3,986 for the year ended December 31, 2014.

[2] As of March 31, 2013, we elected to discontinue hedge accounting prospectively, and as of December 31, 2014, all remaining accumulated other comprehensive income had been transferred to earnings.