Intangible Assets and Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Finite lived intangible assets
Gross Carrying Amount	$ 658,533		$ 658,533		$ 560,342
Accumulated Amortization	(435,213)		(435,213)		(478,169)
Net Carrying Amount	223,320		223,320		82,173
Finite Lived Intangible Assets Amortization Expense	8,000	$ 6,000	16,000	$ 12,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	453,879		453,879		337,438
Accumulated Amortization	(257,095)		(257,095)		(263,121)
Net Carrying Amount	196,784		196,784		74,317
Supplier relationships
Finite lived intangible assets
Gross Carrying Amount	0		0		29,000
Accumulated Amortization	0		0		(27,913)
Net Carrying Amount	0		0		1,087
Software & technology
Finite lived intangible assets
Gross Carrying Amount	168,695		168,695		160,825
Accumulated Amortization	(151,291)		(151,291)		(154,610)
Net Carrying Amount	17,404		17,404		6,215
Trademarks & other
Finite lived intangible assets
Gross Carrying Amount	35,959		35,959		33,079
Accumulated Amortization	(26,827)		(26,827)		(32,525)
Net Carrying Amount	$ 9,132		$ 9,132		$ 554