Summary of Significant Accounting Policies (Details 7) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Basic EPS:
Net loss	$ (28,568,000)	$ (1,961,000)	$ (101,661,000)	$ (2,097,000)	$ 1,157,000	$ 2,044,000	$ (2,924,000)	$ (908,000)	$ (134,287,000)	$ (631,000)	$ (11,685,000)
Preferred stock dividends									(5,557,000)	(5,744,000)	(5,750,000)
Net loss allocated to common stockholders and participating securities									(139,844,000)	(6,375,000)	(17,435,000)
Loss allocated to participating securities									0
Net loss available to common stockholders									(139,844,000)	(6,375,000)	(17,435,000)
Weighted average shares outstanding for basic earnings per common share									25,513,277	25,082,921	24,454,796
Basic earnings per share (in dollars per share)									$ (5.48)	$ (0.25)	$ (0.71)
Diluted EPS:
Net loss	(28,568,000)	(1,961,000)	(101,661,000)	(2,097,000)	1,157,000	2,044,000	(2,924,000)	(908,000)	(134,287,000)	(631,000)	(11,685,000)
Preferred stock dividends									(5,557,000)	(5,744,000)	(5,750,000)
Net loss allocated to common stockholders and participating securities									(139,844,000)	(6,375,000)	(17,435,000)
Loss allocated to participating securities									0
Net loss available to common stockholders									(139,844,000)	(6,375,000)	(17,435,000)
Weighted average shares outstanding for basic earnings per common share									25,513,277	25,082,921	24,454,796
Weighted average shares outstanding for diluted earnings per common share									25,513,277	25,082,921	24,454,796
Diluted earnings per share (in dollars per share)									$ (5.48)	$ (0.25)	$ (0.71)
Participating securities (in shares)									177,375	122,625	65,625
Potential dilutive common shares									15,750,173	16,990,537	17,062,267
Statements of Cash Flows
Cash paid for interest									17,800,000	32,100,000	31,900,000
Cash paid for taxes									$ 382,000	$ 667,000	$ 856,000