Goodwill And Other Intangible Assets, Net (Schedule Of Activity Related To Other Intangible Assets, Net) (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2011		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balances	$ 53,393,000		$ 53,393,000		$ 57,600,000		$ 42,400,000
Additions			10,300,000		3,300,000		11,800,000
Adjustments related to acquisitions							7,200,000
Write-off			(1,100,000)		(2,200,000)
Impairment	(9,100,000)		(9,100,000)
Amortization			(3,500,000)		(5,300,000)		(3,800,000)
Ending balances			50,067,000		53,393,000		57,600,000
Unamortized acquired names			11,700,000
Amortized acquired names			100,000
Amortized Trade Names [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Acquired names weighted-average amortization period, years			2.2
Certificates Of Need And Licenses [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balances	41,700,000		41,700,000		43,400,000		32,700,000
Additions			2,500,000		500,000		3,400,000
Adjustments related to acquisitions							7,300,000
Write-off			(1,100,000)		(2,200,000)
Impairment			(9,100,000)
Ending balances			34,000,000		41,700,000		43,400,000
Acquired Names Of Business [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balances	4,700,000	[1]	4,700,000	[1]	4,700,000	[1]	3,300,000	[1]
Additions			7,300,000	[1]	100,000	[1]	1,400,000	[1]
Amortization			(200,000)	[1]	(100,000)	[1]
Ending balances			11,800,000	[1]	4,700,000	[1]	4,700,000	[1]
Non-Compete Agreements & Reacquired Franchise Rights [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balances	7,000,000	[2]	7,000,000	[2]	9,500,000	[2]	6,400,000	[2]
Additions			500,000	[2]	2,700,000	[2]	7,000,000	[2]
Adjustments related to acquisitions							(100,000)	[2]
Amortization			(3,300,000)	[2]	(5,200,000)	[2]	(3,800,000)	[2]
Ending balances			$ 4,200,000	[2]	$ 7,000,000	[2]	$ 9,500,000	[2]
Non-Compete Agreements [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Acquired names weighted-average amortization period, years			2.0
Reacquired Franchise Rights [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Acquired names weighted-average amortization period, years			1.5

[1] Acquired Name of Business includes $11.7 million of unamortized acquired names and $0.1 million of amortized acquired names which have a weighted-average amortization period of 2.2 years.

[2] The weighted-average amortization period of our non-compete agreements and reacquired franchise rights is 2.0 and 1.5 years, respectively.