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Shareholders' equity (Tables) | 3 Months Ended
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Mar. 31, 2017
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, 2016 | $ | (7,931 | ) |  | $ | (454 | ) |  | $ | (24,744 | ) |  | $ | (33,129 | ) |  | $ | (454 | ) |  | $ | 132 |  |  | $ | (322 | )
Current period other comprehensive income | 223 |  |  | 454 |  |  | 308 |  |  | 985 |  |  | 454 |  |  | 5 |  |  | 459 |
Balance, March 31, 2017 | $ | (7,708 | ) |  | $ | — |  |  | $ | (24,436 | ) |  | $ | (32,144 | ) |  | $ | — |  |  | $ | 137 |  |  | $ | 137 |
Balance, December 31, 2015 | $ | (1,872 | ) |  | $ | (54 | ) |  | $ | (24,336 | ) |  | $ | (26,262 | ) |  | $ | — |  |  | $ | 925 |  |  | $ | 925 |
Current period other comprehensive income | 7,428 |  |  | 1,056 |  |  | 316 |  |  | 8,800 |  |  | 1,002 |  |  | 14 |  |  | 1,016 |
Balance, March 31, 2016 | $ | 5,556 |  |  | $ | 1,002 |  |  | $ | (24,020 | ) |  | $ | (17,462 | ) |  | $ | 1,002 |  |  | $ | 939 |  |  | $ | 1,941 |
Schedule of reclassifications out of accumulated other comprehensive income/(loss) | Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  |
|  | Three months ended March 31 |  | Affected line item in the
(in thousands) |  | 2017 |  | 2016 |  | Statement of Income
HEI consolidated |  |  |  |  |  |
Derivatives qualifying as cash flow hedges |  |  |  |  |  |  |  |
Window forward contracts |  | $ | 454 |  |  | $ | — |  |  | Revenue-electric utilities (losses on window forward contracts - see Note 4 for additional details)
Interest rate contracts (settled in 2011) |  | $ | — |  |  | $ | 54 |  |  | Interest expense
Retirement benefit plan items |  |  |  |  |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 3,921 |  |  | 3,537 |  |  | See Note 6 for additional details
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets |  | (3,613 | ) |  | (3,222 | ) |  | See Note 6 for additional details
Total reclassifications |  | $ | 762 |  |  | $ | 369 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |
Derivatives qualifying as cash flow hedges |  |  |  |  |  |
Window forward contracts |  | $ | 454 |  |  | $ | — |  |  | Revenue (losses on window forward contracts - see Note 4 for additional details)
Retirement benefit plan items |  |  |  |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 3,618 |  |  | 3,236 |  |  | See Note 6 for additional details
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets |  | (3,613 | ) |  | (3,222 | ) |  | See Note 6 for additional details
Total reclassifications |  | $ | 459 |  |  | $ | 14 |  |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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