Retirement Plans, Components of Net Periodic Benefit Cost, Pension Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of net periodic benefit cost [Abstract]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Recognition of actuarial loss	$ (58,147)	$ (44,491)	$ 31,755
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	6,538	7,961	7,671
Interest cost	14,779	14,239	15,630
Expected return on plan assets	(28,399)	(26,244)	(23,790)
Amortization of actuarial loss	34	4,193	2,399
Net periodic benefit cost	7,048	149	1,910
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Current year actuarial (gain) loss	58,015	(44,583)	31,616
Recognition of actuarial loss	34	(4,193)	(2,399)
Total recognized in other comprehensive income	58,049	(48,776)	29,217
Total recognized in net periodic benefit cost and other comprehensive income	65,097	(48,627)	31,127
SERP [Member]
Components of net periodic benefit cost [Abstract]
Service cost	0	0	0
Interest cost	29	31	40
Expected return on plan assets	0	0	0
Amortization of actuarial loss	30	40	35
Net periodic benefit cost	59	71	75
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Current year actuarial (gain) loss	74	(12)	55
Recognition of actuarial loss	30	(40)	(35)
Total recognized in other comprehensive income	104	(52)	20
Total recognized in net periodic benefit cost and other comprehensive income	$ 45	$ 19	$ 95