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, 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised	731	0	0	731	0	0
Retirement of shares upon vesting of restricted stock	(1,056)	1	0	(1,057)	0	0
Share-based compensation expense	4,216	0	0	4,216	0	0
Issuance of shares under employee stock purchase plan	287	0	0	287	0	0
Derivative fair value adjustment, net of tax	(1,617)	0	0	0	(1,617)	0
Preferred stock dividend	(5,139)	0	0	0	0	(5,139)
Net income	14,082	0	0	0	0	14,082
Ending stockholders' equity at Dec. 31, 2013	$ 99,095	$ 64	$ 1	$ 280,711	$ (1,096)	$ (180,585)