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SEGMENT INFORMATION - Revenues from External Customers (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from external customers: |  |  |  |
Benchmark percentage of revenue for major customer |  | 10.00% | 10.00% | 10.00%
Total operating revenues |  | $ 448,750 | $ 430,604 | $ 143,537
Collaborative Arrangement |  |  |  |
Revenues from external customers: |  |  |  |
Time and voyage charter revenues |  | 23,359 | 73,931 | 28,327
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 | $ 66,691 |  | $ 251,070 | $ 106,302
Concentration risk percentage | 16.00% |  | 62.00% | 91.00%
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 |  | $ 218,096 | $ 127,625 | $ 0
Concentration risk percentage |  | 51.00% | 31.00% | 0.00%
Time Charter | Collaborative Arrangement |  |  |  |
Revenues from external customers: |  |  |  |
Total operating revenues | $ 23,400 | $ 23,359 | $ 73,931 | $ 28,327

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