Significant Accounting Policies Significant Accounting Policies (Concentration of Credit Risk) (Details) (Sales Revenue, Services, Net [Member])	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
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	41.00%	42.00%	43.00%
Feredal Medicare program (Part D & Part B) [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	47.00%	46.00%	45.00%
State Medicaid Programs [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	9.00%	9.00%	10.00%
Other sources [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	3.00%	3.00%	2.00%