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Shareholders' equity (Tables) | 9 Months Ended
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Sep. 30, 2018
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 |  | Unrealized gains (losses) on derivatives |  | Retirement benefit plans |  | AOCI
Balance, December 31, 2017 | $ | (14,951 | ) |  | $ | — |  |  | $ | (26,990 | ) |  | $ | (41,941 | ) |  | $ | — |  |  | $ | (1,219 | ) |  | $ | (1,219 | )
Current period other comprehensive income (loss) | (22,768 | ) |  | — |  |  | 1,581 |  |  | (21,187 | ) |  | — |  |  | 85 |  |  | 85 |
Balance, September 30, 2018 | $ | (37,719 | ) |  | $ | — |  |  | $ | (25,409 | ) |  | $ | (63,128 | ) |  | $ | — |  |  | $ | (1,134 | ) |  | $ | (1,134 | )
Balance, December 31, 2016 | $ | (7,931 | ) |  | $ | (454 | ) |  | $ | (24,744 | ) |  | $ | (33,129 | ) |  | $ | (454 | ) |  | $ | 132 |  |  | $ | (322 | )
Current period other comprehensive income | 2,452 |  |  | 454 |  |  | 1,003 |  |  | 3,909 |  |  | 454 |  |  | 67 |  |  | 521 |
Balance, September 30, 2017 | $ | (5,479 | ) |  | $ | — |  |  | $ | (23,741 | ) |  | $ | (29,220 | ) |  | $ | — |  |  | $ | 199 |  |  | $ | 199 |
Schedule of reclassifications out of accumulated other comprehensive income/(loss) | Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  |
|  | Three months ended September 30 |  | Nine months ended September 30 |  | Affected line item in the
(in thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | Statements of Income / Balance Sheets
HEI consolidated |  |  |  |  |  |  |  |  |  |
Derivatives qualifying as cash flow hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Window forward contracts |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 454 |  |  | Property, plant and equipment-electric utilities
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 5,259 |  |  | 3,942 |  |  | 15,755 |  |  | 11,793 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (4,725 | ) |  | (3,596 | ) |  | (14,174 | ) |  | (10,790 | ) |  | See Note 8 for additional details
Total reclassifications |  | $ | 534 |  |  | $ | 346 |  |  | $ | 1,581 |  |  | $ | 1,457 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |
Derivatives qualifying as cash flow hedges: |  |  |  |  |  |  |  |  |  |
Window forward contracts |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 454 |  |  | Property, plant and equipment
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 4,753 |  |  | 3,618 |  |  | 14,259 |  |  | 10,857 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (4,725 | ) |  | (3,596 | ) |  | (14,174 | ) |  | (10,790 | ) |  | See Note 8 for additional details
Total reclassifications |  | $ | 28 |  |  | $ | 22 |  |  | $ | 85 |  |  | $ | 521 |  |  |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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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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