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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 28,116 $ 42,920 $ 58,260  
Restricted cash (cash held in escrow) 49,760   33,448  
Restricted cash (certificate of deposits) 9,162   0  
Restricted cash (held with Trustee) 5,730   4,137  
Total cash and cash equivalents, and restricted cash $ 92,768 $ 88,538 $ 95,845 $ 55,921