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Retirement Plans, Components of Net Periodic Benefit Cost, Pension Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]      
Recognition of actuarial loss $ (44,491) $ 31,755 $ 6,548
Pension Plan [Member]      
Components of net periodic benefit cost [Abstract]      
Service cost 7,961 7,671 7,364
Interest cost 14,239 15,630 16,493
Expected return on plan assets (26,244) (23,790) (20,956)
Amortization of actuarial loss 4,193 2,399 1,438
Net periodic benefit cost 149 1,910 4,339
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]      
Current year actuarial loss (44,583) 31,616 6,497
Recognition of actuarial loss (4,193) (2,399) (1,438)
Total recognized in other comprehensive income (48,776) 29,217 5,059
Total recognized in net periodic benefit cost and other comprehensive income (48,627) 31,127 9,398
SERP [Member]      
Components of net periodic benefit cost [Abstract]      
Service cost 0 0 0
Interest cost 31 40 52
Expected return on plan assets 0 0 0
Amortization of actuarial loss 40 35 28
Net periodic benefit cost 71 75 80
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]      
Current year actuarial loss (12) 55 73
Recognition of actuarial loss (40) (35) (28)
Total recognized in other comprehensive income (52) 20 45
Total recognized in net periodic benefit cost and other comprehensive income $ 19 $ 95 $ 125