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SIGNIFICANT ACCOUNTING POLICIES - Depreciation and Amortization (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Depreciation and Amortization      
Depreciation and amortization $ 18,164,000 $ 16,384,000 $ 14,662,000
Deferred Financing Costs      
Accumulated amortization of deferred financing costs 2,090,000 4,628,000  
Federal Income Taxes      
Federal excise tax expense $ 6,000 $ 174,000 $ 302,000
Capital gain distributions (as a percent) 27.00% 67.00% 26.00%
Commercial properties      
Depreciation and Amortization      
Estimated useful life 40 years