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Long-term debt - Changes in Long-term Debt (Details) - Senior notes	Dec. 31, 2023 USD ($)
HEI Series 2023A
Debt Instrument [Line Items]
Aggregate principal amount	$ 39,000,000
Fixed coupon interest rate	6.04%
HEI Series 2023B
Debt Instrument [Line Items]
Aggregate principal amount	$ 61,000,000
Fixed coupon interest rate	6.10%

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