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Selected Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effect of Fourth Quarter Events [Line Items]                      
Total revenues $ 219,567 $ 202,997 $ 184,290 $ 194,690 $ 202,922 $ 186,588 $ 169,605 $ 177,539 $ 801,544 $ 736,654 $ 691,710
Gross profit 169,004 160,369 147,585 157,431 163,021 151,537 132,974 144,972 634,389 592,504 560,386
Income from operations 54,275 5,323 44,591 45,961 42,705 41,402 19,468 38,290 150,150 141,865 121,391
(Provision) benefit for income taxes 16,480 10,705 4,264 7,176 11,979 6,640 801 4,318 38,625 23,738 (29,250)
Net income $ 51,932 $ 5,844 $ 39,076 $ 29,669 $ 36,251 $ 20,427 $ 19,981 $ 26,437 $ 126,521 $ 103,096 $ 142,112
Net income per share, basic (USD per share) $ 0.17 $ 0.02 $ 0.14 $ 0.10 $ 0.13 $ 0.07 $ 0.07 $ 0.09 $ 0.44 $ 0.36 $ 0.50
Net income per share, diluted (USD per share) $ 0.17 $ 0.02 $ 0.13 $ 0.10 $ 0.13 $ 0.07 $ 0.07 $ 0.09 $ 0.42 $ 0.35 $ 0.49
Total pre-tax expense                 $ 33,051 $ 8,091 $ 7,882
Expenses associated with initial public offering                 26,130 0 0
Restricted Stock and Restricted Stock Units (RSUs)                      
Effect of Fourth Quarter Events [Line Items]                      
Total pre-tax expense   $ 15,445             $ 15,102 $ 0 $ 0