CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Shares	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Treasury Stock	Total
Balance at Dec. 31, 2013	$ 3,920	$ 1,781,535	$ (774,220)	$ 2,158	$ (21,058)	$ 992,335
Balance (in shares) at Dec. 31, 2013	391,974
Increase (Decrease) in Shareholders' Equity
Equity-based compensation		79,741				79,741
Derivatives, net				(1,391)		(1,391)
Restricted stock awards and units	$ 4	(4)
Restricted stock awards and units (in shares)	469
Restricted stock forfeitures		2			(2)
Purchase of treasury stock		(1,084)			(10,012)	(11,096)
Net loss			279,370			279,370
Balance at Dec. 31, 2014	$ 3,924	1,860,190	(494,850)	767	(31,072)	1,338,959
Balance (in shares) at Dec. 31, 2014	392,443
Increase (Decrease) in Shareholders' Equity
Equity-based compensation		75,267				75,267
Derivatives, net				$ (767)		(767)
Restricted stock awards and units	$ 15	(15)
Restricted stock awards and units (in shares)	1,460
Restricted stock forfeitures		16			(16)
Purchase of treasury stock		(2,269)			(15,841)	(18,110)
Net loss			(69,836)			(69,836)
Balance at Dec. 31, 2015	$ 3,939	1,933,189	(564,686)		(46,929)	1,325,513
Balance (in shares) at Dec. 31, 2015	393,903
Increase (Decrease) in Shareholders' Equity
Equity-based compensation		43,391	(1,944)			41,447
Restricted stock awards and units	$ 20	(20)
Restricted stock awards and units (in shares)	1,956
Restricted stock forfeitures		2			(2)
Purchase of treasury stock		(1,315)			(666)	(1,981)
Net loss			(283,780)			(283,780)
Balance at Dec. 31, 2016	$ 3,959	$ 1,975,247	$ (850,410)		$ (47,597)	$ 1,081,199
Balance (in shares) at Dec. 31, 2016	395,859