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Retirement Plans, Components of Net Periodic Benefit Cost, Other Postretirement Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other changes in benefit obligations recognized in other comprehensive income [Abstract] |  |  |  |
Recognition of actuarial gain | [1] | $ 31,755 | $ 6,548 | $ (7,322)
Other Postretirement Benefits [Member] |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |
Interest cost |  | 22 | 31 | 24
Amortization of actuarial gain |  | (522) | (540) | (596)
Net periodic benefit cost |  | (500) | (509) | (572)
Other changes in benefit obligations recognized in other comprehensive income [Abstract] |  |  |  |
Current year actuarial loss (gain) |  | 84 | (22) | 144
Recognition of actuarial gain |  | 522 | 540 | 596
Total recognized in other comprehensive income |  | 606 | 518 | 740
Total recognized in net periodic benefit cost and other comprehensive income |  | $ 106 | $ 9 | $ 168
[1] | Actuarial gains (losses) are amortized into other income (expense). (See Note 12 – Retirement Plans)

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