Intangible Assets and Goodwill (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Finite lived intangible assets
Gross Carrying Amount	$ 576,432,000		$ 576,432,000		$ 593,155,000
Accumulated Amortization	(484,635,000)		(484,635,000)		(472,768,000)
Net Carrying Amount	91,797,000		91,797,000		120,387,000
Finite Lived Intangible Assets Amortization Expense	9,000,000	8,000,000	26,000,000	26,000,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	342,136,000		342,136,000		354,373,000
Accumulated Amortization	(260,478,000)		(260,478,000)		(251,388,000)
Net Carrying Amount	81,658,000		81,658,000		102,985,000
Supplier relationships
Finite lived intangible assets
Gross Carrying Amount	29,000,000		29,000,000		29,000,000
Accumulated Amortization	(27,188,000)		(27,188,000)		(25,013,000)
Net Carrying Amount	1,812,000		1,812,000		3,987,000
Software & technology
Finite lived intangible assets
Gross Carrying Amount	164,557,000		164,557,000		167,009,000
Accumulated Amortization	(156,920,000)		(156,920,000)		(155,009,000)
Net Carrying Amount	7,637,000		7,637,000		12,000,000
Trademarks & trade names
Finite lived intangible assets
Gross Carrying Amount	33,523,000		33,523,000		35,366,000
Accumulated Amortization	(32,839,000)		(32,839,000)		(33,985,000)
Net Carrying Amount	684,000		684,000		1,381,000
Non-compete agreements
Finite lived intangible assets
Gross Carrying Amount	7,216,000		7,216,000		7,407,000
Accumulated Amortization	(7,210,000)		(7,210,000)		(7,373,000)
Net Carrying Amount	$ 6,000		$ 6,000		$ 34,000