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Summary of Significant Accounting Policies - Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Anti-dilutive common equivalent shares excluded from calculation                 200    
Net income per share:                      
Net income available to common stockholders $ 9,712 $ 704 $ 556 $ 6,062 $ 8,463 $ 8,838 $ 14,669 $ 13,915 $ 17,034 $ 45,885 $ 126,959
Weighted average common shares outstanding used in computing basic income per share                 32,559 32,286 30,866
Weighted average common shares used in computing diluted net income per share                 33,828 34,002 33,436
Net income per share                      
Basic $ 0.30 $ 0.02 $ 0.02 $ 0.19 $ 0.26 $ 0.27 $ 0.46 $ 0.43 $ 0.52 $ 1.42 $ 4.11
Diluted $ 0.29 $ 0.02 $ 0.02 $ 0.18 $ 0.25 $ 0.26 $ 0.43 $ 0.41 $ 0.50 $ 1.35 $ 3.80
Restricted Stock                      
Net income per share:                      
Incremental options and RSUs                 1,269 1,716 2,570