Intangible Assets and Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Finite lived intangible assets
Gross Carrying Amount	$ 642,184		$ 642,184		$ 631,288
Accumulated Amortization	(490,165)		(490,165)		(466,116)
Net Carrying Amount	152,019		152,019		165,172
Amortization expense	8,000	$ 11,000	17,000	$ 21,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	452,614		452,614		445,039
Accumulated Amortization	(319,812)		(319,812)		(300,906)
Net Carrying Amount	132,802		132,802		144,133
Software & technology
Finite lived intangible assets
Gross Carrying Amount	152,589		152,589		150,037
Accumulated Amortization	(139,947)		(139,947)		(136,508)
Net Carrying Amount	12,642		12,642		13,529
Trademarks & other
Finite lived intangible assets
Gross Carrying Amount	36,981		36,981		36,212
Accumulated Amortization	(30,406)		(30,406)		(28,702)
Net Carrying Amount	$ 6,575		$ 6,575		$ 7,510