CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Shares	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Treasury Stock
Balance at Dec. 31, 2012	$ 1,028,906	$ 3,914	$ 1,712,880	$ (683,176)	$ 3,685	$ (8,397)
Balance (in shares) at Dec. 31, 2012		391,424
Increase (Decrease) in Shareholders' Equity
Equity-based compensation	18,938		18,938
Derivatives, net	(359)				(359)
Restricted stock awards (in shares)		23
Restricted stock forfeitures			1			(1)
Purchase of treasury stock	(82)					(82)
Net income	20,094			20,094
Balance at Mar. 31, 2013	$ 1,067,497	$ 3,914	$ 1,731,819	$ (663,082)	$ 3,326	$ (8,480)
Balance (in shares) at Mar. 31, 2013		391,447