XML 61 R47.htm IDEA: XBRL DOCUMENT v3.10.0.1
Investment in Real Estate - Summary of Real Estate Held for Investment (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Real Estate [Abstract]    
Land $ 1,220,267 $ 1,204,700
Building and improvements 4,443,050 4,389,846
Tenant improvements 443,548 397,012
Furniture and fixtures 8,756 8,576
Property under development 303,261 219,227
Investment in real estate, at cost $ 6,418,882 $ 6,219,361