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LEASES, Future Minimum Lease Payments Under Operating Leases (Details) - USD ($)
6 Months Ended
Jun. 30, 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 $ 18,826,000  
2020 29,857,000  
2021 24,685,000  
2022 21,532,000  
2023 17,583,000  
Thereafter 94,907,000  
Total lease payments 207,390,000  
Less: imputed interest (40,998,000)  
Operating lease liabilities $ 166,392,000  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019   $ 97,091,000
2020   30,062,000
2021   21,818,000
2022   20,263,000
2023   17,429,000
Thereafter   91,939,000
Future minimum lease payments under operating leases   $ 278,602,000