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OTHER LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Deferred tax liability, net $ 6,445 $ 6,284
Deferred ground rent expense 3,867 3,802
Deferred tenant revenue 4,532 3,280
Environmental remediation costs 1,232 1,309
Other liabilities 466 0
Total Other liabilities $ 16,542 $ 14,675