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Net Income (Loss) Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net Income (Loss) Per Share [Abstract]        
Net income (loss) used for calculation of basic and diluted EPS $ (21,376,000) $ (12,259,000) $ 23,753,000 $ (15,367,000)
Weighted average shares outstanding, basic 30,059,329 27,651,297 29,739,326 26,960,664
Net income (loss) per share, basic $ (0.71) $ (0.44) $ 0.80 $ (0.57)
Basic weighted average common shares outstanding (in shares) 30,059,329 27,651,297 29,739,326 26,960,664
Stock options and restricted stock units 0 0 2,058,006 0
Weighted average shares outstanding, diluted 30,059,329 27,651,297 31,797,332 26,960,664
Diluted income (loss) per common share (in dollars per share) $ (0.71) $ (0.44) $ 0.75 $ (0.57)
Stock Options excluded from diluted EPS(in shares) 2,020,204 2,270,771 738,882 2,376,747