Basis Of Presentation (Details)	Sep. 30, 2011
Ownership Interests [Line Items]
Number Of Centers Owned Less Than 51 Percent	3
Ownership Interests Less Than 51 Percent [Member] | Consolidated [Member]
Ownership Interests [Line Items]
Number Of Centers Owned Less Than 51 Percent	1
Nonconsolidated [Member]
Ownership Interests [Line Items]
Number Of Centers Owned Less Than 51 Percent	2