Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 28,620	$ 16,525	$ 348	$ 29,699	$ (50,831)	$ 14,331	$ 14,041	$ 19,671	$ 75,192	$ (2,788)	$ 31,409
Less: Net (income) loss allocated to unvested participating restricted stock									1,886	(1,173)	351
Net income (loss) available to common stockholders - basic									70,733	(29,974)	9,236
Effect of unvested participating restricted stock									34	0	0
Numerator - net income available to common shareholders - diluted									70,767	(29,974)	9,236
Weighted average outstanding shares of common stock - basic									17,846	17,240	16,917
Weighted average outstanding shares of common stock - diluted									18,185	17,240	16,917
Net income (loss) per common share - Basic	$ 1.55	$ 0.86	$ (0.02)	$ 1.59	$ (3.33)	$ 0.45	$ 0.43	$ 0.75	$ 3.96	$ (1.74)	$ 0.55
Net income (loss) per common share - Diluted	$ 1.51	$ 0.85	$ (0.02)	$ 1.53	$ (3.33)	$ 0.44	$ 0.42	$ 0.75	$ 3.89	$ (1.74)	$ 0.55
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount										993	848
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities, Stock Options									339	0	0
Series A Preferred Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Less: Series A preferred stock dividends									0	(25,927)	(19,531)
Series B Convertible Preferred Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Less: Accretion of Series B preferred stock									(2,573)	(2,432)	(2,291)
Effect of dilutive securities, Convertible Series B preferred stock									0	0	0
Common Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average outstanding shares of common stock - basic									17,846	17,240	16,917
Weighted average outstanding shares of common stock - diluted									18,185	17,240	16,917
Restricted Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Less: Net (income) loss allocated to unvested participating restricted stock									$ (1,886)	$ 1,173	$ (351)