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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | $ 205 | $ 524
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | 24 | 31
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | 2,503 | 5,146
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | 2,322 | 4,653
Impact of D&Os of the PUC included in regulatory assets |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | (2,298) | (4,622)
Impact of D&Os of the PUC included in regulatory assets | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | $ (2,298) | $ (4,622)

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