Intangibles Assets and Goodwill - Intangibles (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Intangibles
Gross Carrying Amount	$ 763,789	$ 745,471
Amortization	(389,344)	(338,450)
Intangible Asset, net	374,445	407,021
Customer relationships
Intangibles
Gross Carrying Amount	507,901	507,905
Amortization	(226,123)	(190,666)
Intangible Asset, net	281,778	317,239
Developed technology
Intangibles
Gross Carrying Amount	89,053	89,053
Amortization	(86,966)	(85,967)
Intangible Asset, net	2,087	3,086
Trade names
Intangibles
Gross Carrying Amount	8,400	9,400
Amortization	(3,100)	(3,100)
Intangible Asset, net	5,300	6,300
Impairment charge	1,000	3,700
Accumulated impairment losses	44,100	43,100
Outsource contract costs
Intangibles
Gross Carrying Amount	60,514	46,342
Amortization	(36,303)	(27,719)
Intangible Asset, net	24,212	18,623
Internally developed software
Intangibles
Gross Carrying Amount	41,971	36,820
Amortization	(9,956)	(6,278)
Intangible Asset, net	32,015	30,542
Trademarks
Intangibles
Gross Carrying Amount	23,378	23,379
Amortization	(23,370)	(23,370)
Intangible Asset, net	8	9
Non compete agreements
Intangibles
Gross Carrying Amount	1,350	1,350
Amortization	(1,350)	(1,350)
Assembled workforce
Intangibles
Gross Carrying Amount	4,473	4,473
Amortization	(839)
Intangible Asset, net	3,634	4,473
Purchased software
Intangibles
Gross Carrying Amount	26,749	26,749
Amortization	(1,337)
Intangible Asset, net	25,412	$ 26,749
Goodwill.
Intangibles
Impairment charge	$ 98,700