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SIGNIFICANT ACCOUNTING POLICIES - CUSTOMER CONCENTRATION (Details) - Serves customers - customer | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Ocean Transportation |  |  |
Number of largest customers | 10 | 10 | 10
Number of customers | 0 |  |
Ocean Transportation | Revenue |  |  |
Concentration percentage | 22.00% | 23.00% | 24.00%
Logistics |  |  |
Number of largest customers | 10 | 10 | 10
Number of customers | 0 |  |
Logistics | Revenue |  |  |
Concentration percentage | 19.00% | 21.00% | 23.00%

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