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Net Income (Loss) Per Share (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net Income (Loss) Per Share [Abstract]    
Net income (loss) used for calculation of basic and diluted EPS $ (30,363,000) $ 45,129,000
Basic weighted average number of common shares (in shares) 34,503,845 29,415,768
Net income (loss) per share, basic $ (0.88) $ 1.53
Basic weighted average common shares outstanding (in shares) 34,503,845 29,415,768
Stock options and restricted stock units (in shares) 0 2,268,406
Weighted average shares outstanding, diluted 34,503,845 31,684,174
Diluted income (loss) per common share (in dollars per share) $ (0.88) $ 1.42
Stock options excluded from diluted EPS (in shares) 1,415,558 2,719,339