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Net Income Per Share - (Basic and Diluted Net Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net income $ 8,036 $ 7,300 $ 23,105 $ 21,282
Weighted-average shares outstanding — basic (in shares) 35,806 35,994 35,983 35,634
Dilutive effect of employee stock plans (in shares) 807 838 887 983
Weighted-average shares outstanding — diluted (in shares) 36,613 36,832 36,870 36,617
Net income per share — basic (in dollars per share) $ 0.22 $ 0.20 $ 0.64 $ 0.60
Net income per share — diluted (in dollars per share) $ 0.22 $ 0.20 $ 0.63 $ 0.58
Anti-dilutive weighted-average shares related to stock award plans (in shares) 478 427 380 364