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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Net Income (Loss) Attributable to Parent $ (15,711) $ (6,619) $ (23,101) $ 49,630
Undistributed Earnings, Basic 0 0 0 (1,641)
Undistributed Earnings, Diluted 0 0 0 (1,630)
Dividends 6,243 0 12,392 0
Dividends attributable to common stockholders under the two class method 6,050 0 12,035 0
Weighted-average common shares outstanding - basic 48,330,149 48,332,878 48,068,038 46,886,820
Weighted Average Number Diluted Shares Outstanding Adjustment 199,956 308,496 220,899 352,315
Net Income (Loss) Available to Common Stockholders, Basic (15,904) (6,619) (23,458) 47,989
Net Income (Loss) Available to Common Stockholders, Diluted $ (15,904) $ (6,619) $ (23,458) $ 48,000
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – basic - As Reported   48,332,878   46,886,820
Weighted-average common shares outstanding - diluted 48,530,105 48,641,374 48,288,937 47,239,135
Basic earnings (loss) per share $ (0.33) $ (0.14) $ (0.49) $ 1.02
Diluted earnings (loss) per share $ (0.33) $ (0.14) $ (0.49) $ 1.02