Acquisitions, Intangible Assets and Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite lived intangible assets
Gross Carrying Amount	$ 310,589	$ 414,922
Accumulated Amortization	(119,949)	(201,722)
Net Carrying Amount	190,640	213,200
Amortization expense	36,000	39,000	$ 28,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	265,665	338,320
Accumulated Amortization	(88,550)	(149,539)
Net Carrying Amount	177,115	188,781
Software & technology
Finite lived intangible assets
Gross Carrying Amount	31,600	54,297
Accumulated Amortization	(19,999)	(35,325)
Net Carrying Amount	11,601	18,972
Trademarks & other
Finite lived intangible assets
Gross Carrying Amount	13,324	22,305
Accumulated Amortization	(11,400)	(16,858)
Net Carrying Amount	$ 1,924	$ 5,447