Intangible Assets and Goodwill - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Intangibles
Gross Carrying Amount	$ 703,033		$ 702,348
Accumulated Amortization	(545,955)		(537,428)
Intangible Asset, net	157,078		164,920
Carrying amount of indefinite-lived trade names which are not amortizable	5,300
Aggregated amortization expense	9,100	$ 11,000
Customer relationships
Intangibles
Gross Carrying Amount	507,750		507,930
Accumulated Amortization	(386,840)		(380,580)
Intangible Asset, net	120,910		127,350
Developed technology
Intangibles
Gross Carrying Amount	88,553		88,554
Accumulated Amortization	(88,073)		(88,085)
Intangible Asset, net	480		469
Patent
Intangibles
Gross Carrying Amount			15
Accumulated Amortization			(14)
Intangible Asset, net			1
Trade names
Intangibles
Gross Carrying Amount	5,300		5,300
Intangible Asset, net	5,300		5,300
Accumulated impairment losses	44,100		44,100
Outsource contract costs
Intangibles
Gross Carrying Amount	18,108		17,734
Accumulated Amortization	(16,489)		(16,334)
Intangible Asset, net	1,619		1,400
Internally developed software
Intangibles
Gross Carrying Amount	56,573		56,066
Accumulated Amortization	(45,191)		(43,499)
Intangible Asset, net	11,382		12,567
Purchased software
Intangibles
Gross Carrying Amount	26,749		26,749
Accumulated Amortization	(9,362)		(8,916)
Intangible Asset, net	$ 17,387		$ 17,833