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Impairments (Details) (USD $)
3 Months Ended9 Months Ended3 Months Ended3 Months Ended
Sep. 30, 2010
Sep. 30, 2010
Sep. 30, 2010
HCP Ventures II
Oct. 12, 2010
HCP Ventures II
Facility
Sep. 30, 2011
Cirrus Health senior secured loan
Dec. 31, 2010
Cirrus Health senior secured loan
Equity method investment, impairment details      
Ownership interest (as a percent)   35.00%  
Number of senior housing facilities   25  
Impairment charges of investment in HCP Ventures II$ 71,693,000$ 71,693,000$ 71,700,000   
Carrying value, equity method investments before impairment  136,800,000   
Fair value, equity method investments  65,100,000   
Impairment charge due to restructuring of its loan    15,400,000 
Loans receivable, before Impairment    91,100,000 
Loans receivable, after Impairment    $ 75,700,000$ 93,100,000