Intangible Assets and Goodwill (Details) (USD $)	3 Months Ended			9 Months Ended														3 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Customer relationships	Dec. 31, 2012 Customer relationships	Sep. 30, 2013 Supplier relationships	Dec. 31, 2012 Supplier relationships	Sep. 30, 2013 Software & technology	Dec. 31, 2012 Software & technology	Sep. 30, 2013 Trademark & trade names	Dec. 31, 2012 Trademark & trade names	Sep. 30, 2013 Non-compete agreements	Dec. 31, 2012 Non-compete agreements	Sep. 30, 2013 Total intangible assets	Dec. 31, 2012 Total intangible assets	Sep. 30, 2013 Management Services
Finite lived intangible assets
Gross Carrying Amount						$ 353,241,000	$ 407,901,000	$ 29,000,000	$ 29,000,000	$ 166,397,000	$ 169,632,000	$ 35,177,000	$ 35,078,000	$ 7,349,000	$ 7,471,000	$ 591,164,000	$ 649,082,000
Accumulated Amortization						(244,275,000)	(269,100,000)	(24,288,000)	(22,113,000)	(153,153,000)	(151,628,000)	(33,549,000)	(32,615,000)	(7,311,000)	(7,412,000)	(462,576,000)	(482,868,000)
Finite lived intangible assets, net	128,588,000			128,588,000		108,966,000	138,801,000	4,712,000	6,887,000	13,244,000	18,004,000	1,628,000	2,463,000	38,000	59,000	128,588,000	166,214,000
Finite Lived Intangible Assets Amortization Expense	8,000,000		9,000,000	26,000,000	30,000,000
Goodwill, Impairment Loss	$ 101,415,000	[1]																$ 100,253,000	[1]

[1]