CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - 3 months ended Mar. 31, 2016 - USD ($) shares in Thousands, $ in Thousands	Common Shares	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Total
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		10,676			10,676
Restricted stock awards and units	$ 3	(3)
Restricted stock awards and units (in shares)	261
Restricted stock forfeitures		1		(1)
Purchase of treasury stock		(583)		(491)	(1,074)
Net loss			(58,993)		(58,993)
Balance at Mar. 31, 2016	$ 3,942	$ 1,943,280	$ (623,679)	$ (47,421)	$ 1,276,122
Balance (in shares) at Mar. 31, 2016	394,164