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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 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Net income $ 62,782 $ 64,496 $ 48,174 $ 56,747 $ 127,278 $ 104,921
Income tax provision 14,992   14,470   35,239 30,935
Interest income and other 912   (2,202)   (122) (7,219)
Interest expense 5,294   5,157   10,091 10,018
Adjusted Segment EBITDA 120,894   105,380   246,340 211,504
Segment Reconciling Items            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Net income 62,782   48,174   127,278 104,921
Income tax provision 14,992   14,470   35,239 30,935
Interest income and other 912   (2,202)   (122) (7,219)
Interest expense 5,294   5,157   10,091 10,018
Unallocated corporate expenses 29,357   30,276   56,067 53,867
Segment depreciation expense 7,834   7,191   15,264 14,337
Amortization of intangible assets 2,853   2,314   5,653 4,645
Remeasurement of acquisition-related contingent consideration (3,130)   0   (3,130) 0
Adjusted Segment EBITDA $ 120,894   $ 105,380   $ 246,340 $ 211,504