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Selected Quarterly Financial Data (unaudited) (Quarterly Financial Information) (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
Selected Quarterly Financial Data (unaudited) [Abstract]                      
Revenue $ 264,912 $ 271,470 $ 219,999 $ 178,461 $ 170,632 $ 190,061 $ 187,103 $ 165,876 $ 934,842 $ 713,672 $ 501,003
Gross profit 199,239 204,036 159,300 135,240 128,068 142,933 140,710 125,147 697,815 536,858 379,899
Income from continuing operations before income taxes 37,850 44,633 28,158 23,624 18,981 20,583 27,778 25,021 134,265 92,363 70,548
Net income $ 27,994 $ 34,453 $ 21,935 $ 18,477 $ 19,881 $ 15,902 $ 21,383 $ 20,750 $ 102,859 $ 77,916 $ 55,789
Earnings per share - basic $ 2.38 $ 2.93 $ 1.86 $ 1.57 $ 1.71 $ 1.36 $ 1.80 $ 1.75 $ 8.74 $ 6.62 $ 4.67
Earnings per share - diluted $ 2.36 $ 2.91 $ 1.86 $ 1.56 $ 1.66 $ 1.32 $ 1.75 $ 1.70 $ 8.68 $ 6.43 $ 4.62