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Summary of Significant Accounting Policies - Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Anti-dilutive common equivalent shares excluded from calculation 1,951 232,844  
Net income per share:      
Net income available to common stockholders $ 49,982 $ 17,034 $ 45,885
Weighted average common shares outstanding used in computing basic income per share 33,257 32,559 32,286
Weighted average common shares used in computing diluted net income per share 34,128 33,828 34,002
Net income per share      
Basic $ 1.50 $ 0.52 $ 1.42
Diluted $ 1.46 $ 0.50 $ 1.35
Restricted Stock      
Net income per share:      
Incremental options and RSUs 871 1,269 1,716