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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%