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SEGMENT INFORMATION - Revenues from External Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Collaborative Arrangement |  |  |
Revenues from external customers: |  |  |
Time and voyage charter revenues |  | $ 23,359 | $ 73,931
The Cool Pool | Non-collaborative Arrangement Transactions |  |  |
Revenues from external customers: |  |  |
Time and voyage charter revenues |  | 43,300 |
The Cool Pool | Sales Revenue, net | Customer Concentration Risk |  |  |
Revenues from external customers: |  |  |
Concentration risk amount | $ 0 | $ 66,691 | $ 251,070
Concentration risk percentage | 0.00% | 16.00% | 62.00%
The Cool Pool | Sales Revenue, net | Customer Concentration Risk | Non-collaborative Arrangement Transactions |  |  |
Revenues from external customers: |  |  |
Time and voyage charter revenues |  | $ 66,700 |
Perenco and SNH | Sales Revenue, net | Customer Concentration Risk |  |  |
Revenues from external customers: |  |  |
Concentration risk amount | $ 226,061 | $ 218,096 | $ 127,625
Concentration risk percentage | 54.00% | 51.00% | 31.00%
An international major trading house | Sales Revenue, net | Customer Concentration Risk |  |  |
Revenues from external customers: |  |  |
Concentration risk amount | $ 46,090 | $ 25,371 | $ 0
Concentration risk percentage | 11.00% | 6.00% | 0.00%
A European major trading house | Sales Revenue, net | Customer Concentration Risk |  |  |
Revenues from external customers: |  |  |
Concentration risk amount | $ 43,536 | $ 8,908 | $ 0
Concentration risk percentage | 10.00% | 2.00% | 0.00%

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