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Commitments and Contingencies (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Commitments and Contingencies    
Co-investment commitments in partnership   $ 98,800,000
Consolidated Affiliates    
Commitments and Contingencies    
Other commitments   18,200,000
Other commitment, expected payments   10,200,000
Other commitments, present value of expected payments   9,400,000
Consolidated Affiliates | Scenario, Forecast    
Commitments and Contingencies    
Other commitment, expected payments $ 8,200,000  
Equity Method Investee    
Commitments and Contingencies    
Other commitments   $ 170,000,000
Equity Method Investee | Scenario, Forecast    
Commitments and Contingencies    
Other commitment, expected payments $ 0