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Segment information - Revenue from external customers (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | $ 309,702 | $ 248,665
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | The Cool Pool |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | $ 66,691 | $ 141,024
Concentration risk, percentage | 23.00% | 61.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Perenco and SNH |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | $ 163,571 | $ 73,101
Concentration risk, percentage | 56.00% | 31.00%

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