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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits | $ (1,876) | $ 137 | $ (8,335) | $ 1,619
Reclassification adjustment to net income, tax expense (benefits) | 0 | 0 | 0 | (289)
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) | (1,832) | (2,516) | (5,486) | (7,526)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes | 1,639 | 2,290 | 4,916 | 6,872
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Reclassification adjustment to net income, tax expense (benefits) | 0 | 0 | 0 | (289)
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) | (1,648) | (2,306) | (4,945) | (6,916)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes | $ 1,639 | $ 2,290 | $ 4,916 | $ 6,872

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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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