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Other Comprehensive Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit Plans Net Of Tax Abstract [Abstract]        
Amortization of actuarial losses $ 3,074 $ 2,150 $ 6,159 $ 4,307
Amortization of prior service costs 277 365 548 730
Total before tax 3,351 2,515 6,707 5,037
Tax (benefit) provision (774) (421) (1,548) (989)
Net of tax 2,577 2,094 5,159 4,048
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]        
Net (gains) losses reclassified into earnings (1,877) (752) (3,710) 668
Tax expense (benefit) 417 158 839 (140)
Net of tax $ (1,460) $ (594) $ (2,871) $ 528