Other Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 292,799,000		$ 292,799,000		$ 308,412,000
Less accumulated amortization	(144,833,000)		(144,833,000)		(144,047,000)
Other intangible assets, net	147,966,000		147,966,000		164,365,000
Amortization expense for finite-lived intangible assets	7,100,000	8,300,000	20,500,000	19,300,000
Other intangible assets reclassified to assets of discontinued operations	500,000		500,000		2,600,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	261,815,000		261,815,000		276,112,000
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	6,366,000		6,366,000		7,898,000
Trade Names and Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 24,618,000		$ 24,618,000		$ 24,402,000