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10-K Employee Benefit Plans - Nonqualified benefit plans, weighted average assumptions (Details) - Nonqualified Plan
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Defined benefit plan disclosure, net periodic benefit cost [Line Items]    
Benefit obligation discount rate 4.97% 2.38%
Net periodic benefit cost discount rate 2.38% 1.95%