Significant Accounting Policies Significant Accounting Policies (Concentration of Credit Risk) (Details) (Sales Revenue, Services, Net [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Concentration Risk [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Private Pay, third-party and facilities [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	39.00%	41.00%	42.00%
Feredal Medicare program (Part D & Part B) [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	50.00%	47.00%	46.00%
State Medicaid Programs [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	7.00%	9.00%	9.00%
Other sources [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	4.00%	3.00%	3.00%