Intangible Assets and Goodwill - Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Intangibles
Gross Carrying Amount	$ 702,348	$ 701,065
Accumulated Amortization	(537,428)	(500,083)
Intangible Asset, net	164,920	200,982
Impairment charge	0
Carrying amount of indefinite-lived trade names which are not amortizable	5,300
Aggregated amortization expense	$ 40,500	$ 47,300
Customer relationships
Intangibles
Weighted Average Useful Life (in years)	8 years 4 months 24 days	9 years
Gross Carrying Amount	$ 507,930	$ 507,723
Accumulated Amortization	(380,580)	(351,240)
Intangible Asset, net	$ 127,350	$ 156,483
Developed technology
Intangibles
Weighted Average Useful Life (in years)	1 year 2 months 12 days	2 years 1 month 6 days
Gross Carrying Amount	$ 88,554	$ 88,553
Accumulated Amortization	(88,085)	(88,000)
Intangible Asset, net	$ 469	$ 553
Patent
Intangibles
Weighted Average Useful Life (in years)	2 months 12 days	1 year 2 months 12 days
Gross Carrying Amount	$ 15	$ 15
Accumulated Amortization	(14)	(6)
Intangible Asset, net	1	9
Trade names
Intangibles
Gross Carrying Amount	5,300	8,400
Accumulated Amortization		(3,100)
Intangible Asset, net	5,300	5,300
Accumulated impairment losses	$ 44,100	$ 44,100
Outsource contract costs
Intangibles
Weighted Average Useful Life (in years)	2 years 6 months	3 years
Gross Carrying Amount	$ 17,734	$ 17,184
Accumulated Amortization	(16,334)	(15,509)
Intangible Asset, net	$ 1,400	$ 1,675
Internally developed software
Intangibles
Weighted Average Useful Life (in years)	2 years 7 months 6 days	2 years 10 months 24 days
Gross Carrying Amount	$ 56,066	$ 52,441
Accumulated Amortization	(43,499)	(35,095)
Intangible Asset, net	$ 12,567	$ 17,346
Purchased software
Intangibles
Weighted Average Useful Life (in years)	10 years	11 years
Gross Carrying Amount	$ 26,749	$ 26,749
Accumulated Amortization	(8,916)	(7,133)
Intangible Asset, net	$ 17,833	$ 19,616