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Prepaid Expenses and Other Assets, net (Details) - USD ($)
3 Months Ended
Oct. 05, 2018
Mar. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Derivative assets   $ 10,463,000 $ 16,687,000
Goodwill   8,754,000 8,754,000
Non-real estate investment   3,138,000 2,713,000
Investment in unconsolidated entities   86,000 86,000
Other   60,000,000 27,393,000
Prepaid expenses and other assets, net   82,441,000 $ 55,633,000
Deposits for future acquisitions   35,600,000  
Commitment to fund real estate technology venture capital fund $ 20,000,000.0    
Purchase of U.S. Government securities   425,000  
Remaining contribution amount   $ 19,600,000  
VIE, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Ownership Interest   21.00%