Acquisitions, Divestiture, Intangible Assets and Goodwill (Intangible Assets Disclosure) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite lived intangible assets
Gross Carrying Amount	$ 631,288	$ 622,364
Accumulated Amortization	(466,116)	(434,986)
Net Carrying Amount	165,172	187,378
Intangible assets acquired	19,000
Amortization expense for intangible assets	40,000	37,000	$ 34,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	445,039	437,459
Accumulated Amortization	(300,906)	(272,353)
Net Carrying Amount	144,133	165,106
Software & technology
Finite lived intangible assets
Gross Carrying Amount	150,037	149,591
Accumulated Amortization	(136,508)	(135,198)
Net Carrying Amount	13,529	14,393
Trademarks & other
Finite lived intangible assets
Gross Carrying Amount	36,212	35,314
Accumulated Amortization	(28,702)	(27,435)
Net Carrying Amount	$ 7,510	$ 7,879