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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | $ 548 | $ 205
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | 26 | 24
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 | 5,706 | 2,503
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 | 5,184 | 2,322
Impact of D&Os of the PUC included in regulatory assets |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | (5,158) | (2,298)
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 | $ (5,158) | $ (2,298)

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