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Segment information - Revenue from external customers (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | $ 211,032 | $ 125,564
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | The Cool Pool |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | $ 66,691 | $ 83,959
Concentration risk, percentage | 33.00% | 74.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Perenco and SNH |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | $ 109,048 | $ 18,577
Concentration risk, percentage | 54.00% | 16.00%

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