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Long-term debt - Changes in Long-term Debt (Details) - Senior notes	Dec. 31, 2022 USD ($)
HEI Series 2022A
Debt Instrument [Line Items]
Aggregate principal amount	$ 30,000,000
Fixed coupon interest rate	2.98%
HEI Series 2022B
Debt Instrument [Line Items]
Aggregate principal amount	$ 20,000,000
Fixed coupon interest rate	3.94%
HEI Series 2022C
Debt Instrument [Line Items]
Aggregate principal amount	$ 75,000,000
Fixed coupon interest rate	5.43%
HEI Green Series 2022D
Debt Instrument [Line Items]
Aggregate principal amount	$ 35,000,000
Fixed coupon interest rate	5.43%

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