Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings (Deficit)
Beginning Balance at Dec. 31, 2009	$ 340,149	$ 424	$ 330,553	$ (13,963)	$ 23,135
Beginning Balance (in shares) at Dec. 31, 2009		42,394,809
Issuances of restricted stock				6,896	(6,896)
Amortization of share based compensation	5,666		5,666
Purchase of treasury stock	(359)			(359)
Exercise of stock options / vesting of restricted stock	30		(292)	542	(220)
Net income (loss)	(43,563)				(43,563)
Ending Balance at Dec. 31, 2010	301,923	424	335,927	(6,884)	(27,544)
Beginning Balance (in shares) at Dec. 31, 2010		42,394,809
Issuances of restricted stock			(32)	5,783	(5,751)
Amortization of share based compensation	7,955		7,955
Purchase of treasury stock	(1,872)			(1,872)
Exercise of stock options / vesting of restricted stock	4,534	1	1,769	2,973	(209)
Exercise of stock options / vesting of restricted stock		136,000
Net income (loss)	47,163				47,163
Ending Balance at Dec. 31, 2011	359,703	425	345,619		13,659
Ending Balance (in shares) at Dec. 31, 2011		42,530,809
Issuances of restricted stock (in shares)		969,223
Issuances of restricted stock		10	(526)	516
Amortization of share based compensation	11,389		11,389
Purchase of treasury stock	(18,497)			(18,497)
Exercise of stock options / vesting of restricted stock	798		(795)	1,593
Net income (loss)	20,854				20,854
Ending Balance at Dec. 31, 2012	$ 374,247	$ 435	$ 355,687	$ (16,388)	$ 34,513
Ending Balance (in shares) at Dec. 31, 2012		43,500,032