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Investments in Unconsolidated Entities (Summary of Investments in Unconsolidated Entities) (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated entities $ 558,354,000 $ 744,151,000
Triple Net [Member]    
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated entities $ 35,657,000 $ 31,511,000
Triple Net [Member] | Minimum [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage [1] 10.00% 10.00%
Triple Net [Member] | Maximum [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage [1] 49.00% 49.00%
Seniors Housing Facilities Operating [Member]    
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated entities $ 485,278,000 $ 539,147,000
Seniors Housing Facilities Operating [Member] | Minimum [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage [1] 10.00% 10.00%
Seniors Housing Facilities Operating [Member] | Maximum [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage [1] 50.00% 50.00%
Outpatient Medical [Member]    
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated entities $ 37,419,000 $ 173,493,000
Outpatient Medical [Member] | Minimum [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage [1] 36.00% 36.00%
Outpatient Medical [Member] | Maximum [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage [1] 49.00% 49.00%
[1] (1) Excludes ownership of in-substance real estate.