Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Finite-lived and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (545,277)	$ (481,188)
Total	373,577
Indefinite-Lived Trade Names, Accumulated Impairment Charge	58,933	58,933
Gross Carrying Amount, Trade names (unamortized)	274,721	258,471
Total, Trade names (unamortized)	215,788	199,538
Gross Carrying Amount, Total	1,198,409	1,127,848
Accumulated Impairment Charge, Total	(63,767)	(63,767)
Total	589,365	582,893
Customer relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	717,666	670,155
Accumulated Amortization	(374,764)	(324,426)
Accumulated Impairment Charge	(4,834)	(4,834)
Total	338,068	340,895
Developed technology/Vendor network
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	95,661	95,661
Accumulated Amortization	(69,688)	(64,994)
Accumulated Impairment Charge	0	0
Total	25,973	30,667
Trade names (amortized)
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	32,366	31,516
Accumulated Amortization	(24,180)	(23,002)
Accumulated Impairment Charge	0	0
Total	8,186	8,514
Contract backlog
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	77,995	72,045
Accumulated Amortization	(76,645)	(68,766)
Accumulated Impairment Charge	0	0
Total	$ 1,350	$ 3,279