Intangible Assets and Goodwill - Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Intangibles
Gross Carrying Amount	$ 702,338	$ 700,173
Accumulated Amortization	(457,799)	(407,509)
Intangible Asset, net	244,539	292,664
Impairment charge	0	0
Carrying amount of indefinite-lived trade names which are not amortizable	5,300
Aggregated amortization expense	$ 50,500	$ 54,700	$ 59,300
Customer relationships
Intangibles
Weighted Average Useful Life (in years)	9 years 6 months	10 years 2 months 12 days
Gross Carrying Amount	$ 508,241	$ 508,485
Accumulated Amortization	(316,084)	(278,306)
Intangible Asset, net	$ 192,157	$ 230,179
Developed technology
Intangibles
Weighted Average Useful Life (in years)	2 years 9 months 18 days	3 years 4 months 24 days
Gross Carrying Amount	$ 88,553	$ 88,553
Accumulated Amortization	(87,612)	(87,111)
Intangible Asset, net	941	1,442
Trade names
Intangibles
Gross Carrying Amount	8,400	8,400
Accumulated Amortization	(3,100)	(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)	3 years 7 months 6 days	3 years 3 months 18 days
Gross Carrying Amount	$ 16,814	$ 16,331
Accumulated Amortization	(14,486)	(13,036)
Intangible Asset, net	$ 2,328	$ 3,295
Internally developed software
Intangibles
Weighted Average Useful Life (in years)	3 years 2 months 12 days	3 years 8 months 12 days
Gross Carrying Amount	$ 49,108	$ 47,182
Accumulated Amortization	(27,812)	(20,152)
Intangible Asset, net	$ 21,296	$ 27,030
Assembled workforce
Intangibles
Weighted Average Useful Life (in years)	1 year	2 years
Gross Carrying Amount	$ 4,473	$ 4,473
Accumulated Amortization	(3,355)	(2,237)
Intangible Asset, net	$ 1,118	$ 2,236
Purchased software
Intangibles
Weighted Average Useful Life (in years)	12 years	13 years
Gross Carrying Amount	$ 26,749	$ 26,749
Accumulated Amortization	(5,350)	(3,567)
Intangible Asset, net	$ 21,399	$ 23,182

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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