Intangible Assets and Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Finite lived intangible assets
Gross Carrying Amount	$ 310,554		$ 310,589
Accumulated Amortization	(128,930)		(119,949)
Net Carrying Amount	181,624		190,640
Amortization expense	9,000	$ 9,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	265,630		265,665
Accumulated Amortization	(95,136)		(88,550)
Net Carrying Amount	170,494		177,115
Software & technology
Finite lived intangible assets
Gross Carrying Amount	31,600		31,600
Accumulated Amortization	(21,576)		(19,999)
Net Carrying Amount	10,024		11,601
Trademarks & other
Finite lived intangible assets
Gross Carrying Amount	13,324		13,324
Accumulated Amortization	(12,218)		(11,400)
Net Carrying Amount	$ 1,106		$ 1,924