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Investment in Real Estate (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Real Estate [Abstract]    
Land $ 1,313,412 $ 1,372,872
Building and improvements 5,189,342 4,991,770
Tenant improvements 631,459 510,217
Furniture and fixtures 10,693 9,320
Property under development 124,222 175,358
Investment in real estate, at cost $ 7,269,128 $ 7,059,537