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Investment in Unconsolidated Ventures - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investment in Unconsolidated Joint Ventures [Line Items]        
Distributions from unconsolidated ventures from cumulative share of net earnings $ 3,472 $ 2,896 $ 8,258  
Carrying amount in unconsolidated real estate and other joint ventures 14,300      
CCRC Venture        
Schedule of Investment in Unconsolidated Joint Ventures [Line Items]        
Equity method liability $ 66,200 $ 56,600    
Non-Recourse First Mortgages | CCRC Venture        
Schedule of Investment in Unconsolidated Joint Ventures [Line Items]        
Proceeds from issuance of debt       $ 434,500
Distributions from unconsolidated ventures from cumulative share of net earnings       $ 221,600