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OPERATING LEASES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Future minimum payments under non-cancellable operating leases:      
2019 $ 5,417    
2020 3,756    
2021 2,682    
2022 2,425    
2023 6,180    
Total minimum lease payments 20,460    
Total rental expense for operating leases 8,200 $ 19,300 $ 29,600
Minimum rentals 6,100    
Contingent rentals 2,200    
Sublease rentals 100    
Vessels leased to third parties      
Minimum contractual future revenues to be received:      
Cost 331,500 191,100  
Accumulated depreciation 35,600 $ 53,600  
Time charters      
Minimum contractual future revenues to be received:      
2019 25,851    
Total $ 25,851