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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income $ 18,806 $ 16,266 $ 53,572 $ 39,522
Weighted average number of common shares outstanding (for basic calculation) 16,200 15,894 16,113 15,790
Dilutive securities 1,086 681 987 619
Diluted (in shares) 17,286 16,575 17,100 16,409
EPS - basic $ 1.16 $ 1.02 $ 3.32 $ 2.50
EPS - diluted $ 1.09 $ 0.98 $ 3.13 $ 2.41