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Net Income / (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Net income / (loss) $ 3,299 $ (254) $ 10,821 $ 32,327
Shares used to compute basic net income / (loss) per share (in shares) 35,232 34,913 35,174 34,849
Dilutive potential common shares        
Stock options (in shares) 102 0 104 113
Unvested restricted stock awards (in shares) 170 0 221 381
Shares used to compute diluted net income / (loss) per share (in shares) 35,504 34,913 35,499 35,343
Basic net income / (loss) per share (in dollars per share) $ 0.09 $ (0.01) $ 0.31 $ 0.93
Diluted net income / (loss) per share (in dollars per share) $ 0.09 $ (0.01) $ 0.30 $ 0.91
Dilutive securities included in the calculation (in shares) 1,005 0 992 1,366
Anti-dilutive securities excluded from the calculation (in shares) 1,206 2,370 1,171 1,000