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Segment information - Revenue from external customers (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 125,564	$ 53,518
Sales Revenue, Net | The Cool Pool | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 83,959	$ 39,444
Concentration Risk, Percentage	74.00%	90.00%
Sales Revenue, Net | Perenco and SNH | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 18,577	$ 0
Concentration Risk, Percentage	16.00%	0.00%
Sales Revenue, Net | An Energy and Logistics Company | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 4,579	$ 4,579
Concentration Risk, Percentage	4.00%	10.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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