CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Common Shares	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Treasury Stock	Total
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		25,242				25,242
Derivatives, net				(194)		(194)
Restricted stock awards and units	7	(7)
Restricted stock awards and units (in shares)	706
Purchase of treasury stock		(99)			(49)	(148)
Net loss			(78,909)			(78,909)
Balance at Mar. 31, 2015	$ 3,931	$ 1,885,326	$ (573,759)	$ 573	$ (31,121)	$ 1,284,950
Balance (in shares) at Mar. 31, 2015	393,149