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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Comprehensive Income [Abstract] |  |  |
Net income for common stock | $ 201,774 | $ 165,297 | $ 248,256
Net unrealized losses on available-for sale investment securities: |  |  |
Net unrealized losses on available-for sale investment securities arising during the period, net of tax benefits of $3,468, $2,886 and $3,763 for 2018, 2017 and 2016, respectively | (9,472) | (4,370) | (5,699)
Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil and $238 for 2018, 2017 and 2016, respectively | 0 | 0 | (360)
Derivatives qualified as cash flow hedges: |  |  |
Effective portion of foreign currency hedge net unrealized losses arising during the period, net of tax benefits of nil, nil and $179 for 2018, 2017 and 2016, respectively | 0 | 0 | (281)
Unrealized interest rate hedging gain (loss), net of tax (expense) benefit of $151, nil and nil for 2018, 2017 and 2016, respectively | (436) | 0 | 0
Reclassification adjustment to net income, net of (taxes) benefits of nil, $289 and $(76) for 2018, 2017 and 2016, respectively | 0 | 454 | (119)
Retirement benefit plans: |  |  |
Net gains (losses) arising during the period, net of (taxes) benefits of $9,810, $(41,129) and $27,703 for 2018, 2017 and 2016, respectively | (28,101) | 65,531 | (43,510)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $7,317, $10,041 and $9,267 for 2018, 2017 and 2016, respectively | 21,015 | 15,737 | 14,518
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of (taxes) benefits of $(2,887), $49,523 and $(18,206) for 2018, 2017 and 2016, respectively | 8,325 | (78,724) | 28,584
Other comprehensive income (loss), net of taxes | (8,669) | (1,372) | (6,867)
Comprehensive income attributable to Hawaiian Electric Company, Inc. | $ 193,105 | $ 163,925 | $ 241,389

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- Definition Reclassification adjustments on pension and post retirement benefits for the accounting impact of the decisions issued by the Public Utilities Commission, net of income taxes. + References No definition available. + Details
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