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Net Income (Loss) Per Share - Basic and Diluted Income (Loss) Per Common Share Computation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net income (loss) used for calculation of basic and diluted EPS $ (40,654) $ 40,464 $ (78,310) $ 10,101
Denominator:        
Weighted average shares outstanding, basic (in shares) 35,784,804 34,616,197 35,373,799 34,560,021
Effect of dilutive securities:        
Stock options and restricted stock units (in shares) 0 1,401,214 0 1,406,966
Weighted average shares outstanding, diluted 35,784,804 36,017,411 35,373,799 35,966,987
Basic net income (loss) per common share (in usd per share) $ (1.14) $ 1.17 $ (2.21) $ 0.29
Diluted net income (loss) per common share (in usd per share) $ (1.14) $ 1.12 $ (2.21) $ 0.28