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, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income	$ 51,428	$ 59,321	$ 62,782	$ 64,496	$ 110,749	$ 127,278
Income tax provision	13,353		14,992		30,320	35,239
Interest income and other	(2,994)		912		(2,647)	(122)
Interest expense	2,448		5,294		5,090	10,091
Adjusted Segment EBITDA	113,140		120,894		234,208	246,340
Segment Reconciling Items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income	51,428		62,782		110,749	127,278
Income tax provision	13,353		14,992		30,320	35,239
Interest income and other	(2,994)		912		(2,647)	(122)
Interest expense	2,448		5,294		5,090	10,091
Unallocated corporate expenses	37,716		29,357		69,055	56,067
Segment depreciation expense	8,452		7,834		16,636	15,264
Amortization of intangible assets	2,737		2,853		5,005	5,653
Remeasurement of acquisition-related contingent consideration	0		(3,130)		0	(3,130)
Adjusted Segment EBITDA	$ 113,140		$ 120,894		$ 234,208	$ 246,340