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REAL ESTATE PROPERTIES - Schedule of Real Estate Properties (Including Properties Held For Sale) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Real Estate [Abstract]    
Land $ 163,862 $ 138,094
Building 943,775 808,366
Building improvements 40,274 31,411
Real estate properties 1,147,911 977,871
Accumulated depreciation (88,109) (66,621)
Total real estate properties, net $ 1,059,802 $ 911,250