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Prepaid Expenses and Other Assets, net (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Deposits and pre-development costs for future acquisitions $ 27,135,000   $ 27,135,000   $ 21,585,000
Prepaid insurance 9,091,000   9,091,000   3,463,000
Goodwill 8,754,000   8,754,000   8,754,000
Non-real estate investments 4,216,000   4,216,000   5,545,000
Deferred financing costs 1,477,000   1,477,000   3,246,000
Prepaid property tax 3,145,000   3,145,000   2,070,000
Derivative assets 13,000   13,000   479,000
Other 26,896,000   26,896,000   23,832,000
PREPAID EXPENSES AND OTHER ASSETS, NET 80,727,000   80,727,000   $ 68,974,000
Investment Holdings [Line Items]          
Cash payment on disposal 1,160,000        
Unrealized loss on non-real estate investment 0 $ 0 (1,600,000) $ 0  
Cumulative unrealized loss on non-real estate investment (600,000)   (600,000)    
Entities that report NAV, unrealized gain (loss) on investment 500,000 $ 0 (700,000) $ 0  
Real estate technology venture capital fund          
Investment Holdings [Line Items]          
Entities that report NAV, investment, commitment of funding     20,000,000.0    
Entities that report NAV, investment, contributions to date 6,000,000.0   6,000,000.0    
Entities that report NAV, investment, remaining to be contributed $ 14,000,000.0   $ 14,000,000.0