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LEASES, Future Minimum Lease Payments Under Operating Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
LEASES [Abstract]    
Percentage of costs relate to service costs for leased towing vessels 75.00%  
Future Minimum Lease Payments Under Operating Leases [Abstract]    
2019 $ 27,402  
2020 28,989  
2021 24,086  
2022 21,278  
2023 17,236  
Thereafter 92,798  
Total lease payments 211,789  
Less: imputed interest (44,011)  
Operating lease liabilities $ 167,778  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019   $ 97,091
2020   30,062
2021   21,818
2022   20,263
2023   17,429
Thereafter   91,939
Future minimum lease payments under operating leases   $ 278,602