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Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Schedule of computation of basic and diluted earnings per share        
Net Income (Loss) $ 11,642 $ (2,778) $ 25,459 $ 4,755
Preferred stockholder dividends 0 (705) 0 (2,113)
Allocation of earnings to preferred stockholders 0 0 (64) (476)
Net Income (Loss) Attributable to Common Stockholders $ 11,642 $ (3,483) $ 25,395 $ 2,166
Basic: Weighted-average number of shares outstanding 7,843,000 6,219,000 7,692,000 6,222,000
Plus: Incremental shares from assumed conversion of dilutive instruments 274,000 0 363,000 673,000
Diluted: Weighted-average number of shares outstanding 8,117,000 6,219,000 8,055,000 6,895,000
Earnings(Loss)per share - basic $ 1.48 $ (0.56) $ 3.30 $ 0.35
Earnings(Loss) per share - diluted $ 1.43 $ (0.56) $ 3.15 $ 0.31
Earnings per Share (Textual) [Abstract]        
Antidilutive shares excluded from calculation of weighted-average shares for diluted EPS 0 248,909 0 0