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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net unrealized gains (losses) on securities arising during the period, tax (benefits) $ 7,008 $ 10,024 $ (3,468)
Reclassification adjustment for net realized gains included in net income, tax expenses (599) (175) 0
Foreign currency hedge net unrealized loss, taxes (benefits) (607) (409) (151)
Net gains (losses) arising during the period, taxes (benefits) (20,907) 3,892 (9,810)
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits 8,247 3,512 7,317
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits $ 13,825 $ (5,610) $ 2,887