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Earnings per share and shareholders' equity (Tables) | 6 Months Ended
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Jun. 30, 2015
Equity [Abstract] |
Schedule of earnings per share | Under the two-class method of computing earnings per share (EPS), EPS was comprised as follows for both participating securities (i.e., restricted shares that became fully vested in the fourth quarter of 2014) and unrestricted common stock:
| Three months ended June 30, 2014 |  | Six months ended June 30, 2014
| Basic |  | Diluted |  | Basic |  | Diluted
Distributed earnings | $ | 0.31 |  |  | $ | 0.31 |  |  | $ | 0.62 |  |  | $ | 0.62 |
Undistributed earnings | 0.10 |  |  | 0.10 |  |  | 0.24 |  |  | 0.23 |
| $ | 0.41 |  |  | $ | 0.41 |  |  | $ | 0.86 |  |  | $ | 0.85 |
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 losses on derivatives |  | Retirement benefit plans |  | AOCI |  | AOCI -retirement benefit plans
Balance, December 31, 2014 | $ | 462 |  |  | $ | (289 | ) |  | $ | (27,551 | ) |  | $ | (27,378 | ) |  | $ | 45 |
Current period other comprehensive income (loss) | (243 | ) |  | 118 |  |  | 1,056 |  |  | 931 |  |  | 7 |
Balance, June 30, 2015 | $ | 219 |  |  | $ | (171 | ) |  | $ | (26,495 | ) |  | $ | (26,447 | ) |  | $ | 52 |
Balance, December 31, 2013 | $ | (3,663 | ) |  | $ | (525 | ) |  | $ | (12,562 | ) |  | $ | (16,750 | ) |  | $ | 608 |
Current period other comprehensive income | 3,348 |  |  | 118 |  |  | 601 |  |  | 4,067 |  |  | 22 |
Balance, June 30, 2014 | $ | (315 | ) |  | $ | (407 | ) |  | $ | (11,961 | ) |  | $ | (12,683 | ) |  | $ | 630 |
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 |  |
(in thousands) |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | Affected line item in the Statement of Income
HEI consolidated |  |  |  |  |  |  |  |  |  |
Net realized gains on securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (1,715 | ) |  | Revenues-bank (net gains on sales of securities)
Derivatives qualified as cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contracts (settled in 2011) |  | 59 |  |  | 59 |  |  | 118 |  |  | 118 |  |  | Interest expense
Retirement benefit plan items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 5,780 |  |  | 2,873 |  |  | 11,239 |  |  | 5,686 |  |  | See Note 6 for additional details
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets |  | (5,272 | ) |  | (2,575 | ) |  | (10,183 | ) |  | (5,085 | ) |  | See Note 6 for additional details
Total reclassifications |  | $ | 567 |  |  | $ | 357 |  |  | $ | 1,174 |  |  | $ | (996 | ) |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |
Retirement benefit plan items |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | $ | 5,257 |  |  | $ | 2,588 |  |  | $ | 10,190 |  |  | $ | 5,107 |  |  | See Note 6 for additional details
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets |  | (5,272 | ) |  | (2,575 | ) |  | (10,183 | ) |  | (5,085 | ) |  | See Note 6 for additional details
Total reclassifications |  | $ | (15 | ) |  | $ | 13 |  |  | $ | 7 |  |  | $ | 22 |  |  |

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