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INVESTMENTS IN REAL ESTATE (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Real Estate [Abstract]      
Land $ 329,200   $ 343,564
Land improvements 26,009   26,177
Buildings and improvements 1,382,817   1,475,415
Furniture, fixtures, and equipment 4,847   4,955
Tenant improvements 151,072   159,677
Work in progress 10,456   11,706
Investments in real estate 1,904,401   2,021,494
Accumulated depreciation (398,909)   (414,552)
Net investments in real estate 1,505,492   $ 1,606,942
Depreciation expense $ 14,684 $ 15,673