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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Income and Comprehensive Income      
Net income $ 671,135 $ 618,158 $ 107,681
Reclassification to retained earnings due to cumulative effect of accounting change (50) (605) 0
Other comprehensive income (loss) before tax:      
Foreing currency translation adjustment (6,847) (6,902) (3,078)
Adjustment of pension and postretirement benefit plans (21,874) (15,497) (8,465)
Amortization of net losses of pension and postretirement benefit plans 23,508 21,542 22,428
Amortization of prior service credit of pension and postretirement benefit plans 0 (3,470) (3,800)
Unrealized holding gains (losses) on debt securities arising during the period 286,063 (71,255) (45,307)
Other-than-temporary impairment included in net income 0 0 8,299
Reclassification adjustment for (gains) losses included in net income (loss) 20 0 (83)
Unrealized holding gains on equity securities arising during the period 0 0 151
Reclassification adjustment for gains included in net income 0 0 (251)
Unrealized net (losses) gains on cash flow hedges (5,741) 536 (1,295)
Reclassification adjustment for net losses (gains) included in net income 3,882 (1,110) 1,888
Other comprehensive income (loss) before tax 278,961 (76,761) (29,513)
Income tax (expense) benefit (20,925) (561) (853)
Total other comprehensive income (loss), net of tax 258,036 (77,322) (30,366)
Comprehensive income (loss), net of tax $ 929,171 $ 540,836 $ 77,315