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Shareholders' equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Equity [Abstract] |
Schedule of accumulated other comprehensive income | Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows:
| HEI Consolidated |  | Hawaiian Electric Consolidated
(in thousands) | Net unrealized gains (losses) on securities |  | Unrealized gains (losses) on derivatives |  | Retirement benefit plans |  | AOCI |  | AOCI-Retirement benefit plans
Balance, December 31, 2018 | $ | (24,423 | ) |  | $ | (436 | ) |  | $ | (25,751 | ) |  | $ | (50,610 | ) |  | $ | 99 |
Current period other comprehensive income (loss) | 23,593 |  |  | (1,063 | ) |  | 410 |  |  | 22,940 |  |  | 47 |
Balance, June 30, 2019 | $ | (830 | ) |  | $ | (1,499 | ) |  | $ | (25,341 | ) |  | $ | (27,670 | ) |  | $ | 146 |
Balance, December 31, 2017 | $ | (14,951 | ) |  | $ | — |  |  | $ | (26,990 | ) |  | $ | (41,941 | ) |  | $ | (1,219 | )
Current period other comprehensive income (loss) | (17,645 | ) |  | — |  |  | 1,047 |  |  | (16,598 | ) |  | 57 |
Balance, June 30, 2018 | $ | (32,596 | ) |  | $ | — |  |  | $ | (25,943 | ) |  | $ | (58,539 | ) |  | $ | (1,162 | )
Schedule of reclassifications out of accumulated other comprehensive income/(loss) | Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  |
|  | Three months ended June 30 |  | Six months ended June 30 |  | Affected line item in the
(in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | Statements of Income / Balance Sheets
HEI consolidated |  |  |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | $ | 2,503 |  |  | $ | 5,350 |  |  | $ | 5,006 |  |  | $ | 10,496 |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (2,298 | ) |  | (4,827 | ) |  | (4,596 | ) |  | (9,449 | ) |  | See Note 9 for additional details
Total reclassifications |  | $ | 205 |  |  | $ | 523 |  |  | $ | 410 |  |  | $ | 1,047 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | $ | 2,321 |  |  | $ | 4,853 |  |  | $ | 4,643 |  |  | $ | 9,506 |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (2,298 | ) |  | (4,827 | ) |  | (4,596 | ) |  | (9,449 | ) |  | See Note 9 for additional details
Total reclassifications |  | $ | 23 |  |  | $ | 26 |  |  | $ | 47 |  |  | $ | 57 |  |  |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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