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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income $ (37,060) $ 16,606 $ 18,803 $ 34,766
Weighted average number of common shares outstanding (for basic calculation) 19,821 16,091 19,153 16,070
Dilutive securities 0 909 1,159 894
Diluted (in shares) 19,821 17,000 20,312 16,964
EPS - basic $ (1.87) $ 1.03 $ 0.98 $ 2.16
Diluted (In dollars per share) $ (1.87) $ 0.98 $ 0.93 $ 2.05