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FAIR VALUE (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Amounts included in:    
Restricted cash $ 9,500 $ 8,700
Recurring Basis    
Assets    
Money Market Funds – JPMorgan Chase, US 1,311  
Interest bearing deposits – various banks 8,869 11,391
Amounts included in:    
Cash and cash equivalents 2,648 4,633
Restricted cash 740 741
Long-term restricted cash 6,792 6,017
Total 10,180 11,391
Recurring Basis | Level 1    
Assets    
Money Market Funds – JPMorgan Chase, US 1,311  
Interest bearing deposits – various banks 8,869 11,391
Amounts included in:    
Cash and cash equivalents 2,648 4,633
Restricted cash 740 741
Long-term restricted cash 6,792 6,017
Total 10,180 11,391
Recurring Basis | Level 2    
Assets    
Money Market Funds – JPMorgan Chase, US 0  
Interest bearing deposits – various banks 0 0
Amounts included in:    
Cash and cash equivalents 0 0
Restricted cash 0 0
Long-term restricted cash 0 0
Total 0 0
Recurring Basis | Level 3    
Assets    
Money Market Funds – JPMorgan Chase, US 0  
Interest bearing deposits – various banks 0 0
Amounts included in:    
Cash and cash equivalents 0 0
Restricted cash 0 0
Long-term restricted cash 0 0
Total $ 0 $ 0