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10-K Employee Benefit Plans - Change in benefit obligation and plan assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Pension benefits    
Change in benefit obligation:    
Benefit obligation at beginning of year $ 44,363 $ 46,783
Service cost 0 0
Interest cost 1,127 1,053
Plan participants' contributions 0 0
Actuarial gain (9,174) (832)
Benefits paid (2,558) (2,641)
Benefit obligation at end of year 33,758 44,363
Change in net plan assets:    
Fair value of plan assets at beginning of year 39,345 40,710
Actual return on plan assets (8,356) 1,276
Employer contributions 0 0
Plan participants' contributions 0 0
Benefits paid (2,558) (2,641)
Fair value of plan assets at end of year 28,431 39,345
Funded status - under (5,327) (5,018)
Amounts recognized in the Consolidated Balance Sheets at December 31:    
Other accrued liabilities 0 0
Noncurrent liabilities - other 5,327 5,018
Benefit obligation liabilities - net amount recognized 5,327 5,018
Amounts recognized in accumulated other comprehensive loss consist of:    
Actuarial (gain) loss 19,087 18,788
Prior service credit 0 0
Total 19,087 18,788
Other postretirement benefits    
Change in benefit obligation:    
Benefit obligation at beginning of year 19,480 21,790
Service cost 522 567
Interest cost 514 492
Plan participants' contributions 3 3
Actuarial gain (5,319) (2,769)
Benefits paid (584) (603)
Benefit obligation at end of year 14,616 19,480
Change in net plan assets:    
Fair value of plan assets at beginning of year 314 505
Actual return on plan assets (473) 17
Employer contributions 426 392
Plan participants' contributions 3 3
Benefits paid (584) (603)
Fair value of plan assets at end of year (314) 314
Funded status - under (14,930) (19,166)
Amounts recognized in the Consolidated Balance Sheets at December 31:    
Other accrued liabilities 1,044 544
Noncurrent liabilities - other 13,886 18,622
Benefit obligation liabilities - net amount recognized 14,930 19,166
Amounts recognized in accumulated other comprehensive loss consist of:    
Actuarial (gain) loss (2,057) 3,128
Prior service credit (109) (189)
Total $ (2,166) $ 2,939