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Investment in Real Estate - Summary of Real Estate Held for Investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Real Estate [Abstract]    
Land $ 1,313,411 $ 1,372,872
Building and improvements 4,997,814 4,991,770
Tenant improvements 590,065 510,217
Furniture and fixtures 10,596 9,320
Property under development 250,588 175,358
Investment in real estate, at cost $ 7,162,474 $ 7,059,537