Acquisitions, Intangible Assets and Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Finite lived intangible assets
Gross Carrying Amount	$ 639,942		$ 639,942		$ 622,364
Accumulated Amortization	(465,721)		(465,721)		(434,986)
Net Carrying Amount	174,221		174,221		187,378
Finite Lived Intangible Assets Amortization Expense	10,000	$ 11,000	32,000	$ 27,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	450,890		450,890		437,459
Accumulated Amortization	(299,224)		(299,224)		(272,353)
Net Carrying Amount	151,666		151,666		165,106
Software & technology
Finite lived intangible assets
Gross Carrying Amount	152,201		152,201		149,591
Accumulated Amortization	(137,680)		(137,680)		(135,198)
Net Carrying Amount	14,521		14,521		14,393
Trademarks & other
Finite lived intangible assets
Gross Carrying Amount	36,851		36,851		35,314
Accumulated Amortization	(28,817)		(28,817)		(27,435)
Net Carrying Amount	$ 8,034		$ 8,034		$ 7,879