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Retirement Plans, Components of Net Periodic Benefit Cost, Other Postretirement Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other changes in benefit obligations recognized in other comprehensive income [Abstract]
Recognition of actuarial gain	$ (44,491)	$ 31,755	$ 6,548
Other Postretirement Benefits [Member]
Components of net periodic benefit cost [Abstract]
Interest cost	17	22	31
Amortization of actuarial gain	(451)	(522)	(540)
Net periodic benefit cost	(434)	(500)	(509)
Other changes in benefit obligations recognized in other comprehensive income [Abstract]
Current year actuarial loss (gain)	104	84	(22)
Recognition of actuarial gain	451	522	540
Total recognized in other comprehensive income	555	606	518
Total recognized in net periodic benefit cost and other comprehensive income	$ 121	$ 106	$ 9

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