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Investments in Unconsolidated Entities (Summary of Investments in Unconsolidated Entities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated entities $ 479,382 $ 542,281
Triple Net [Member]    
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated entities $ 24,499 $ 36,351
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 $ 447,987 $ 499,537
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]    
Equity Method Investment, Ownership Percentage [1] 43.00% 43.00%
Investments in unconsolidated entities $ 6,896 $ 6,393
[1] (1) Excludes ownership of in-substance real estate.