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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net income $ 55,863 $ 18,160
Weighted average number of common shares outstanding (for basic calculation) 18,439 16,042
Dilutive securities 1,110 828
Diluted (in shares) 19,549 16,870
EPS - basic $ 3.03 $ 1.13
Diluted (In dollars per share) $ 2.86 $ 1.08