Statement of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Preferred Stock [Member]	Paid-in Capital [Member]	Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Beginning stockholders' equity at Dec. 31, 2009	$ 162,105	$ 61	$ 1	$ 259,981	$ 1,768	$ (99,706)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised	297	1	0	296	0	0
Retirement of shares upon vesting of restricted stock	(507)	0	0	(507)	0	0
Share-based compensation expense	7,137	0	0	7,137	0	0
Derivative fair value adjustment, net of tax	(2,857)	0	0	0	(2,857)	0
Preferred stock dividend	(5,139)	0	0	0	0	(5,139)
Net income	47,126	0	0	0	0	47,126
Ending stockholders' equity at Dec. 31, 2010	208,162	62	1	266,907	(1,089)	(57,719)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised	234	0	0	234	0	0
Retirement of shares upon vesting of restricted stock	(1,368)	0	0	(1,368)	0	0
Share-based compensation expense	4,833	0	0	4,833	0	0
Derivative fair value adjustment, net of tax	5,120	0	0	0	5,120	0
Preferred stock dividend	(5,139)	0	0	0	0	(5,139)
Net income	10,548	0	0	0	0	10,548
Ending stockholders' equity at Dec. 31, 2011	222,390	62	1	270,606	4,031	(52,310)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised	260	0	0	260	0	0
Retirement of shares upon vesting of restricted stock	(1,241)	1	0	(1,242)	0	0
Share-based compensation expense	6,910	0	0	6,910	0	0
Derivative fair value adjustment, net of tax	(3,510)	0	0	0	(3,510)	0
Preferred stock dividend	(5,139)	0	0	0	0	(5,139)
Net income	(132,079)	0	0	0	0	(132,079)
Ending stockholders' equity at Dec. 31, 2012	$ 87,591	$ 63	$ 1	$ 276,534	$ 521	$ (189,528)