Allowance for Doubtful Accounts (Narrative) (Details)	1 Months Ended
	Jul. 31, 2011	Jan. 31, 2013 Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of reduction of Medicare payments to nursing centers	11.10%
Percentage of reduction of Medicare payments to plans and providers		2.00%