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Revenue Recognition - Managed Equity REITs (Details) - Managed REITs - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2018
Jun. 30, 2017
Business Management and Incentive Fees            
Business management fees as a percentage of transferred real estate assets         0.50%  
Business management fees as a percentage of average invested capital below the threshold limit         0.70%  
Maximum threshold amount for calculating the business management fees $ 250,000       $ 250,000  
Business management fees as a percentage of average invested capital above the threshold limit         0.50%  
Minimum threshold amount for calculating the business management fees 250,000       $ 250,000  
Business management fees as a percent of average market capitalization below the threshold limit         0.70%  
Business management fees as a percent of average market capitalization above the threshold limit         0.50%  
Contingent incentive business management fee percentage         12.00%  
Measurement period for calculating the annual incentive fee   3 years   3 years    
Aggregate base business management fees $ 29,555   $ 28,643   $ 89,590 $ 84,816
Aggregate incentive business management fees         $ 155,881 $ 52,407