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LEASES - OPERATING (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Operating Leases, Future Minimum Payments Receivable [Abstract]    
2017 $ 5,396  
2018 5,396  
2019 5,396  
2020 5,396  
2021 5,396  
Thereafter 29,230  
Total minimum future rentals 56,210  
Thermal energy generating property and equipment    
Property Subject to or Available for Operating Lease, Net [Abstract]    
Property and equipment under operating lease 75,900 $ 78,200
Accumulated depreciation of property and equipment under operating lease $ 31,400 $ 28,500