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Shareholders' equity | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Shareholders' equity | Shareholders’ equity Accumulated other comprehensive income/(loss). 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) | (13,297 | ) |  | — |  |  | 524 |  |  | (12,773 | ) |  | — |  |  | 31 |  |  | 31 |
Balance, March 31, 2018 | $ | (28,248 | ) |  | $ | — |  |  | $ | (26,466 | ) |  | $ | (54,714 | ) |  | $ | — |  |  | $ | (1,188 | ) |  | $ | (1,188 | )
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 |
Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  |
|  | Three months ended March 31 |  | Affected line item in the
(in thousands) |  | 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 |  | 5,146 |  |  | 3,921 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (4,622 | ) |  | (3,613 | ) |  | See Note 8 for additional details
Total reclassifications |  | $ | 524 |  |  | $ | 762 |  |  |
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 |  | 4,653 |  |  | 3,618 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (4,622 | ) |  | (3,613 | ) |  | See Note 8 for additional details
Total reclassifications |  | $ | 31 |  |  | $ | 459 |  |  |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 + Details
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