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Investments in Unconsolidated Entities (Summary of Investments in Unconsolidated Entities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated entities $ 407,507 $ 457,138
Triple Net [Member]    
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated entities $ 22,543 $ 27,005
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 $ 332,390 $ 407,172
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 $ 52,574 $ 22,961
[1]
Excludes ownership of in-substance real estate.