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Investment in Real Estate - Summary of Real Estate Held for Investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Real Estate [Abstract]    
Land $ 1,365,387 $ 1,204,700
Building and improvements 4,593,702 4,389,846
Tenant improvements 469,556 397,012
Furniture and fixtures 8,965 8,576
Property under development 252,764 219,227
Investment in real estate, at cost $ 6,690,374 $ 6,219,361