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Investment in Real Estate - Summary of Real Estate Held for Investment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Real Estate [Abstract]    
Land $ 1,302,907 $ 1,302,907
Building and improvements 4,476,124 4,480,993
Tenant improvements 425,624 411,706
Furniture and fixtures 8,371 8,608
Property under development 286,367 219,227
Investment in real estate, at cost $ 6,499,393 $ 6,423,441