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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement-related benefit plans:      
Net actuarial loss, taxes $ 3,447 $ 2,379 $ 6,223
Pension settlement, taxes (4,066) 0 0
Amortization of prior service credits, taxes 321 321 321
Amortization of actuarial losses, taxes (1,934) (1,400) (1,624)
Derivatives:      
Unrealized (losses) gains on derivatives, tax 5,571 4,497 1,474
Reclassification adjustment for realized (losses) gains, taxes $ 4,959 $ 1,469 $ 1,248