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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassifications out of accumulated other comprehensive income/(loss) |  |  |  |
Total reclassifications | $ 205 | $ 523 | $ 410 | $ 1,047
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |  |  |
Total reclassifications | 23 | 26 | 47 | 57
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 | 5,350 | 5,006 | 10,496
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 | 2,321 | 4,853 | 4,643 | 9,506
Impact of D&Os of the PUC included in regulatory assets |  |  |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |  |  |
Total reclassifications | (2,298) | (4,827) | (4,596) | (9,449)
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) | $ (4,827) | $ (4,596) | $ (9,449)

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