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Long-term investments - Schedule of Assets and Liabilities Acquired (Details) - Windlectric $ in Thousands	Apr. 16, 2019 USD ($)
Business Acquisition [Line Items]
Working capital	$ 14,279
Property, plant and equipment	311,175
Deferred tax asset	3,479
Asset retirement obligation	(1,600)
Net assets acquired	327,333
Cash	16,751
Net assets acquired, net of cash	$ 310,582

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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