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Earnings Per Share Details As Adjusted (Details) (USD $)
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 $ (15,711,000) $ (6,619,000) $ (23,101,000) $ 49,630,000
Net Income (Loss) Available to Common Stockholders, Basic (15,904,000) (6,619,000) (23,458,000) 47,989,000
Net Income (Loss) Available to Common Stockholders, Diluted (15,904,000) (6,619,000) (23,458,000) 48,000,000
Weighted average number of shares outstanding, basic 48,330,149 48,332,878 48,068,038 46,886,820
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – diluted - As Reported   48,332,878   47,795,819
Weighted average number of shares outstanding, diluted 48,530,105 48,641,374 48,288,937 47,239,135
Basic net income (loss) per common share, As Reported   (0.14)   1.06
Basic earnings (loss) per share $ (0.33) $ (0.14) $ (0.49) $ 1.02
Diluted net income (loss) per common share - As Reported   $ (0.14)   $ 1.04
Diluted earnings (loss) per share $ (0.33) $ (0.14) $ (0.49) $ 1.02