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Income taxes Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Expense (Benefit) [Line Items] |  |  |
Federal current taxes | $ (10,970) | $ (1,520) | $ (15,411)
Federal deferred taxes | $ 91,159 | $ 73,680 | $ 82,138
Reconciliation percentage of amount of income taxes computed at federal statutory rate | 35.00% | 35.00% | 35.00%
Amount of decrease in deferred taxes related to tax gross-up of AFUDC-equity |  | $ 3,500 |
Out-of-period income tax benefit |  | 3,100 |
Out-of-period tax benefit related to utilities |  | 2,700 |
Credit adjustments to interest expense on income taxes | $ 1,700 | 300 | $ 1,400
Amount of accrued interest related to uncertain tax positions |  | 400 |
Difference |  |  |
Income Tax Expense (Benefit) [Line Items] |  |  |
Federal current taxes | (44,732) |  |
Federal deferred taxes | 44,732 |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Income Tax Expense (Benefit) [Line Items] |  |  |
Federal current taxes | 1,108 | 1,313 | (26,965)
Federal deferred taxes | 68,775 | 58,024 | 79,437
Net operating loss carryforwards | 52,000 |  |
Credit adjustments to interest expense on income taxes | $ 700 | $ 300 | $ 500

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