XML 102 R78.htm IDEA: XBRL DOCUMENT v3.22.4
Employee Postretirement Benefits - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
year
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Payment for pension benefits $ 20,000 $ 10,000 $ 11,200
Defined contribution plan, cost $ 6,700 6,500 $ 5,300
Pension Benefits (Pension Plan)      
Defined Benefit Plan Disclosure [Line Items]      
Age for compensation | year 65    
Age below which compensation is reduced | year 62    
Vesting period 5 years    
Investment redemption, notice period 95 days    
Accumulated benefit obligation $ 283,200 378,300  
Decrease in benefit obligation for change in discount rate $ 117,100 15,700  
Increase in benefit obligation for change in expected future compensation   $ 6,800  
Discount rate (as a percent) 5.51% 3.03%  
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Health insurance benefits, requisite age 55 years    
Health insurance benefits, requisite service period 10 years    
Decrease in benefit obligation for change in discount rate $ 17,900 $ 2,600  
Increase in benefit obligation for change in expected healthcare cost trends $ 2,400    
Discount rate (as a percent) 5.52% 3.01%  
Executive Survivor and Supplemental Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 35,600 $ 46,800  
Decrease in benefit obligation for change in discount rate $ 10,200 $ 1,700  
Discount rate (as a percent) 5.51% 2.93%