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SEGMENT INFORMATION - Revenues from External Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting [Abstract] |  |  |
Benchmark percentage of revenue for major customer | 10.00% | 10.00% | 10.00%
Collaborative Arrangement |  |  |
Revenues from external customers: |  |  |
Time and voyage charter revenues | $ 73,931 | $ 28,327 | $ 13,730
The Cool Pool | Sales Revenue, net | Customer Concentration Risk |  |  |
Revenues from external customers: |  |  |
Concentration risk amount | $ 251,070 | $ 106,302 | $ 51,075
Concentration risk percentage | 62.00% | 91.00% | 77.00%
Time and voyage charter revenues | $ 251,100 |  |
The Cool Pool | Sales Revenue, net | Customer Concentration Risk | Collaborative Arrangement |  |  |
Revenues from external customers: |  |  |
Time and voyage charter revenues | 73,900 |  |
The Cool Pool | Sales Revenue, net | Customer Concentration Risk | Non-collaborative Arrangement Transactions |  |  |
Revenues from external customers: |  |  |
Time and voyage charter revenues | 177,200 |  |
Perenco and SNH | Sales Revenue, net | Customer Concentration Risk |  |  |
Revenues from external customers: |  |  |
Concentration risk amount | $ 127,625 | $ 0 | $ 0
Concentration risk percentage | 31.00% | 0.00% | 0.00%
An energy and logistics company | Sales Revenue, net | Customer Concentration Risk |  |  |
Revenues from external customers: |  |  |
Concentration risk amount | $ 9,235 | $ 9,235 | $ 7,975
Concentration risk percentage | 2.00% | 8.00% | 12.00%

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