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Electric utility segment - Condensed consolidating statement of comprehensive income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income for common stock | $ 38,661 | $ 44,128 | $ 72,854 | $ 76,480
Derivatives qualifying as cash flow hedges: |  |  |  |
Reclassification adjustment to net income, net of tax benefits | 0 | 0 | 454 | 54
Effective portion of foreign currency hedge net unrealized gain, net of taxes | 0 | (745) | 0 | 257
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $___, $2,160, $___ and $4,221, respectively | 3,930 | 3,698 | 7,851 | 7,236
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (3,581) | (3,401) | (7,194) | (6,623)
Other comprehensive income, net of taxes | 2,370 | 2,108 | 3,355 | 10,908
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 41,031 | 46,236 | 76,209 | 87,388
Hawaiian Electric Company |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income for common stock | 25,644 | 35,857 | 47,109 | 61,224
Derivatives qualifying as cash flow hedges: |  |  |  |
Reclassification adjustment to net income, net of tax benefits | 0 |  | 454 |
Effective portion of foreign currency hedge net unrealized gain, net of taxes |  | (745) |  | 257
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $___, $2,160, $___ and $4,221, respectively | 3,621 | 3,391 | 7,239 | 6,627
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (3,581) | (3,401) | (7,194) | (6,623)
Other comprehensive income, net of taxes | 40 | (755) | 499 | 261
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 25,684 | 35,102 | 47,608 | 61,485
HELCO |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income for common stock | 3,632 | 5,220 | 8,216 | 9,182
Derivatives qualifying as cash flow hedges: |  |  |  |
Reclassification adjustment to net income, net of tax benefits | 0 |  | 0 |
Effective portion of foreign currency hedge net unrealized gain, net of taxes |  | 0 |  | 0
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $___, $2,160, $___ and $4,221, respectively | 449 | 401 | 952 | 859
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (448) | (402) | (951) | (860)
Other comprehensive income, net of taxes | 1 | (1) | 1 | (1)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 3,633 | 5,219 | 8,217 | 9,181
Maui Electric |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income for common stock | 4,304 | 5,663 | 8,323 | 9,630
Derivatives qualifying as cash flow hedges: |  |  |  |
Reclassification adjustment to net income, net of tax benefits | 0 |  | 0 |
Effective portion of foreign currency hedge net unrealized gain, net of taxes |  | 0 |  | 0
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $___, $2,160, $___ and $4,221, respectively | 344 | 357 | 810 | 775
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (343) | (359) | (810) | (777)
Other comprehensive income, net of taxes | 1 | (2) | 0 | (2)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 4,305 | 5,661 | 8,323 | 9,628
Other subsidiaries |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income for common stock | 0 | 0 | 0 | 0
Derivatives qualifying as cash flow hedges: |  |  |  |
Reclassification adjustment to net income, net of tax benefits | 0 |  | 0 |
Effective portion of foreign currency hedge net unrealized gain, net of taxes |  | 0 |  | 0
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $___, $2,160, $___ and $4,221, respectively | 0 | 0 | 0 | 0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 0 | 0 | 0 | 0
Other comprehensive income, net of taxes | 0 | 0 | 0 | 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 0 | 0 | 0 | 0
Consolidating adjustments |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income for common stock | (7,936) | (10,883) | (16,539) | (18,812)
Derivatives qualifying as cash flow hedges: |  |  |  |
Reclassification adjustment to net income, net of tax benefits | 0 |  | 0 |
Effective portion of foreign currency hedge net unrealized gain, net of taxes |  | 0 |  | 0
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $___, $2,160, $___ and $4,221, respectively | (793) | (758) | (1,762) | (1,634)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 791 | 761 | 1,761 | 1,637
Other comprehensive income, net of taxes | (2) | 3 | (1) | 3
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | (7,938) | (10,880) | (16,540) | (18,809)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income for common stock | 25,644 | 35,857 | 47,109 | 61,224
Derivatives qualifying as cash flow hedges: |  |  |  |
Reclassification adjustment to net income, net of tax benefits | 0 | 0 | 454 | 0
Effective portion of foreign currency hedge net unrealized gain, net of taxes | 0 | (745) | 0 | 257
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $___, $2,160, $___ and $4,221, respectively | 3,621 | 3,391 | 7,239 | 6,627
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (3,581) | (3,401) | (7,194) | (6,623)
Other comprehensive income, net of taxes | 40 | (755) | 499 | 261
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | $ 25,684 | $ 35,102 | $ 47,608 | $ 61,485

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