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Segment Reporting - Reconciliation of Net Income To Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]                
Net income $ 69,480 $ 62,782 $ 64,496 $ 50,172 $ 48,174 $ 56,747 $ 196,758 $ 155,093
Income tax provision 19,155     14,407     54,394 45,342
Interest income and other (5,175)     3,340     (5,297) (3,879)
Interest expense 5,073     5,151     15,164 15,169
Adjusted Segment EBITDA 125,496     115,892     371,836 327,396
Segment Reconciling Items                
Segment Reporting, Other Significant Reconciling Item [Line Items]                
Net income 69,480     50,172     196,758 155,093
Income tax provision 19,155     14,407     54,394 45,342
Interest income and other (5,175)     3,340     (5,297) (3,879)
Interest expense 5,073     5,151     15,164 15,169
Unallocated corporate expenses 25,974     26,061     82,041 79,928
Segment depreciation expense 8,130     7,236     23,394 21,573
Amortization of intangible assets 2,859     2,795     8,512 7,440
Segment special charges 0     6,730     0 6,730
Remeasurement of acquisition-related contingent consideration 0     0     (3,130) 0
Adjusted Segment EBITDA $ 125,496     $ 115,892     $ 371,836 $ 327,396