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	37,000		37,000
Derivatives, net	(717)				(717)
Restricted stock awards and units		5	(5)
Restricted stock awards and units (in shares)		443
Restricted stock forfeitures			2			(2)
Purchase of treasury stock	(13,041)		(416)			(12,625)
Net loss	(50,722)			(50,722)
Balance at Jun. 30, 2013	$ 1,001,426	$ 3,919	$ 1,749,461	$ (733,898)	$ 2,968	$ (21,024)
Balance (in shares) at Jun. 30, 2013		391,867