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10-K Employee Benefit Plans - Nonqualified benefit Plans, narrative (Details) - Nonqualified Plan - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined benefit plan disclosure, net periodic benefit cost [Line Items]      
Plan participant age 65 years    
Benefit period 15 years    
Defined contribution plan, contribution cost $ 1,200 $ 900,000 $ 300,000