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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net income (loss) $ 10,657 $ (4,545)
Basic-weighted average shares outstanding (in shares) 28,008 27,867
Effect of dilutive potential securities (in shares) 565 0
Diluted- weighted average shares outstanding (in shares) 28,573 27,867
Basic (in dollars per share) $ 0.38 $ (0.16)
Diluted (in dollars per share) $ 0.37 $ (0.16)
Antidilutive securities excluded from computation of earnings per share (in shares) 400