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Other Investments - Net Lease Venture (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]          
Gain on consolidation of equity method investment $ 67,900 $ 0 $ 0 $ 0 $ 67,877
Increase in noncontrolling interest from consolidation of equity method investment         188,279
Other income | Net Lease Venture          
Schedule of Equity Method Investments [Line Items]          
Management fee revenue from related party         $ 1,300
Net income attributable to noncontrolling interests | Net Lease Venture          
Schedule of Equity Method Investments [Line Items]          
Management fee revenue from related party   $ 400 $ 300 $ 1,100  
Net Lease | Net Lease Venture          
Schedule of Equity Method Investments [Line Items]          
Equity interest (percent)   51.90%   51.90%  
Equity method investment, related party ownership percentage   0.60%   0.60%  
Equity method investment, related party promote fee percentage   50.00%   50.00%  
Equity method investment, partner ownership percentage   47.50%   47.50%