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Retirement Plans, Components of Net Periodic Benefit Cost, Pension Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]      
Recognition of actuarial loss [1] $ 6,548 $ (7,322) $ (25,776)
Recognition of prior service credit (cost) [1] (926) (2,317) (3,760)
Pension Plan [Member]      
Components of net periodic benefit cost [Abstract]      
Service cost 7,364 7,622 10,677
Interest cost 16,493 15,499 13,729
Expected return on plan assets (20,956) (22,406) (18,195)
Actuarial loss (gain) 1,438 2,890 4,400
Prior service credit 0 0 0
Net periodic benefit cost 4,339 3,605 10,611
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]      
Current year actuarial loss (gain) 6,497 (7,396) 7,562
Recognition of actuarial loss (1,438) (2,890) (37,833)
Recognition of prior service credit (cost) 0 0 0
Total recognized in other comprehensive income 5,059 (10,286) (30,271)
Total recognized in net periodic benefit cost and other comprehensive income 9,398 (6,681) (19,660)
SERP [Member]      
Components of net periodic benefit cost [Abstract]      
Service cost 0 0 0
Interest cost 52 49 58
Expected return on plan assets 0 0 0
Actuarial loss (gain) 28 23 28
Prior service credit 0 0 0
Net periodic benefit cost 80 72 86
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]      
Current year actuarial loss (gain) 73 (70) 42
Recognition of actuarial loss (28) (23) (28)
Recognition of prior service credit (cost) 0 0 0
Total recognized in other comprehensive income 45 (93) 14
Total recognized in net periodic benefit cost and other comprehensive income $ 125 $ (21) $ 100
[1] The discount rate for the Higman pension plan in 2018 was changed from 4.13% as of February 14, 2018 and 4.02% as of March 31, 2018 to 4.40% as of December 31, 2018.Actuarial gains (losses) are amortized into other income (expense). (See Note 11 – Retirement Plans)