Intangible Assets and Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Finite lived intangible assets
Gross Carrying Amount	$ 634,950		$ 631,288
Accumulated Amortization	(475,750)		(466,116)
Net Carrying Amount	159,200		165,172
Amortization expense	8,000	$ 11,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	447,830		445,039
Accumulated Amortization	(308,756)		(300,906)
Net Carrying Amount	139,074		144,133
Software & technology
Finite lived intangible assets
Gross Carrying Amount	150,748		150,037
Accumulated Amortization	(137,693)		(136,508)
Net Carrying Amount	13,055		13,529
Trademarks & other
Finite lived intangible assets
Gross Carrying Amount	36,372		36,212
Accumulated Amortization	(29,301)		(28,702)
Net Carrying Amount	$ 7,071		$ 7,510