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Intangibles Assets and Goodwill - Intangibles (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Oct. 01, 2018	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangibles
Gross Carrying Amount		$ 721,464		$ 721,464	$ 714,568
Amortization		(379,021)		(379,021)	(319,548)
Intangible Asset, net		342,443		342,443	395,020
Impairment of goodwill				348,557	44,427
Aggregated amortization expense				59,300	94,900	$ 67,100
Customer relationships
Intangibles
Gross Carrying Amount		508,074		508,074	507,905
Amortization		(237,313)		(237,313)	(190,666)
Intangible Asset, net		270,761		270,761	317,239
Developed technology
Intangibles
Gross Carrying Amount		89,053		89,053	89,053
Amortization		(87,109)		(87,109)	(85,967)
Intangible Asset, net		1,944		1,944	3,086
Trade names
Intangibles
Gross Carrying Amount		8,400		8,400	9,400
Amortization		(3,100)		(3,100)	(3,100)
Intangible Asset, net		5,300		5,300	6,300
Impairment charge	$ 3,700			1,000	3,700
Accumulated impairment losses		44,100		44,100	43,100
Outsource contract costs
Intangibles
Gross Carrying Amount		16,726		16,726	15,439
Amortization		(11,749)		(11,749)	(8,817)
Intangible Asset, net		4,977		4,977	6,622
Internally developed software
Intangibles
Gross Carrying Amount		43,261		43,261	36,820
Amortization		(12,129)		(12,129)	(6,278)
Intangible Asset, net		31,132		31,132	30,542
Trademarks
Intangibles
Gross Carrying Amount		23,378		23,378	23,379
Amortization		(23,370)		(23,370)	(23,370)
Intangible Asset, net		8		8	9
Non compete agreements
Intangibles
Gross Carrying Amount		1,350		1,350	1,350
Amortization		(1,350)		(1,350)	(1,350)
Assembled workforce
Intangibles
Gross Carrying Amount		4,473		4,473	4,473
Amortization		(1,118)		(1,118)
Intangible Asset, net		3,355		3,355	4,473
Purchased software
Intangibles
Gross Carrying Amount		26,749		26,749	26,749
Amortization		(1,783)		(1,783)
Intangible Asset, net		24,966		24,966	26,749
Goodwill.
Intangibles
Impairment charge		348,600	$ 348,600
Impairment of goodwill	$ 44,400			96,200
Additional impairment charge				252,400
Accumulated impairment losses		$ 560,900		$ 560,900	$ 212,300