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10-K Employee Benefit Plans - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2022
USD ($)
Jul. 01, 2015
Qualified plan | Maximum | Fixed Income Securities      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Targeted allocation percentages   60.00%  
Qualified plan | Maximum | Defined Benefit Plan, Equity Securities      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Targeted allocation percentages   50.00%  
Qualified plan | Minimum | Fixed Income Securities      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Targeted allocation percentages   50.00%  
Qualified plan | Minimum | Defined Benefit Plan, Equity Securities      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Targeted allocation percentages   40.00%  
Qualified plan | Unfunded plan | Pension benefits      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Excess percentage of unrecognized pension actuarial gains and losses   0.10  
Market-related value of assets, average of assets (in years)   5 years  
Qualified plan | Underfunded plan | Pension benefits      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Expected employer contributions in next fiscal year   $ 0  
Additional employer contributions $ 2,700    
Nonqualified Plan      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Plan participant age   65 years  
Nonqualified Plan | Maximum | Fixed Income Securities      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Targeted allocation percentages   90.00%  
Nonqualified Plan | Maximum | Defined Benefit Plan, Equity Securities      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Targeted allocation percentages   20.00%  
Nonqualified Plan | Minimum | Fixed Income Securities      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Targeted allocation percentages   80.00%  
Nonqualified Plan | Minimum | Defined Benefit Plan, Equity Securities      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Targeted allocation percentages   10.00%  
Nonqualified Plan | Unfunded plan | Other postretirement benefits      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Expected employer contributions in next fiscal year   $ 563  
Nonqualified Plan | Underfunded plan | Postretirement Health Coverage      
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Plan participant age     55 years
Years of continuous service     10 years