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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Income (Loss) Per Share [Abstract]        
Net income (loss) used for calculation of basic and diluted EPS $ (33,846) $ (15,442) $ (23,745) $ 8,311
Basic weighted average number of common shares (in shares) 34,766,440 33,339,163 34,629,330 30,952,458
Basic weighted average common shares outstanding (in shares) 34,766,440 33,339,163 34,629,330 30,952,458
Stock options and restricted stock units (in shares) 0 0 0 2,007,775
Weighted average shares outstanding, diluted 34,766,440 33,339,163 34,629,330 32,960,233
Earnings Per Share, Basic $ (0.97) $ (0.46) $ (0.69) $ 0.27
Diluted income (loss) per common share (in dollars per share) $ (0.97) $ (0.46) $ (0.69) $ 0.25
Stock options excluded from diluted EPS (in shares) 1,458,168 1,916,156 1,424,980 911,304