XML 143 R111.htm IDEA: XBRL DOCUMENT v3.24.0.1
Retirement Plans (Funded Status of Retirement Income Plan and Retirement Life Plan) (Details) - Retirement Income Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 311,945 $ 407,758  
Interest cost 15,465 9,944 $ 8,593
Actuarial losses (gains) 12,890 (91,653)  
Benefits paid (14,824) (14,104)  
Benefit obligation, end of year 325,476 311,945 407,758
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets, beginning of year 342,974 450,305  
Actual return on plan assets, net of expenses 16,982 (93,227)  
Benefits paid (14,824) (14,104)  
Fair value of assets, end of year 345,132 342,974 $ 450,305
Funded status 19,656 31,029  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 19,656 31,029  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net actuarial loss 116,558 100,561  
Weighted-Average Liability Asumptions      
Accumulated benefit obligation $ 325,476 $ 311,945