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Prepaid Expenses and Other Assets, net (Details) - USD ($)
3 Months Ended
Oct. 05, 2018
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]        
Deposits for future acquisitions   $ 20,500,000   $ 0
Goodwill   8,754,000   8,754,000
Non-real estate investments   4,637,000   2,713,000
Derivative assets   2,023,000   16,687,000
Other   30,160,000   27,479,000
Prepaid expenses and other assets, net   66,074,000   $ 55,633,000
Unrealized gain on observable changes in fair value   928,000    
Washington State Convention Center Addition        
Variable Interest Entity [Line Items]        
Deposits for future acquisitions     $ 20,500,000  
Purchase price of assets acquired     $ 86,000,000.0  
Remaining future commitment expected to be settled   65,500,000    
Real Estate Technology Venture Capital Fund        
Variable Interest Entity [Line Items]        
Payments to acquire investments   1,900,000    
Commitment to fund real estate technology venture capital fund $ 20,000,000.0      
Remaining contribution amount   $ 18,100,000