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Investment in Real Estate - Summary of Real Estate Held for Investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Real Estate [Abstract]    
Land $ 1,369,320 $ 1,221,450
Building and improvements 4,526,416 4,217,232
Tenant improvements 389,284 361,108
Furniture and fixtures 8,217 4,264
Property under development 265,661 295,239
Investment in real estate, at cost $ 6,558,898 $ 6,099,293