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OPERATING LEASES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Future minimum payments under non-cancellable operating leases:      
2018 $ 1,361    
2019 1,205    
2020 1,205    
2021 1,205    
2022 301    
Total minimum lease payments 5,277    
Total rental expense for operating leases 19,300 $ 29,600 $ 42,800
Vessels leased to third parties      
Minimum contractual future revenues to be received:      
Cost 191,100 191,100  
Accumulated depreciation 53,600 $ 47,500  
Time charters      
Minimum contractual future revenues to be received:      
2018 3,618    
Total $ 3,618