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Retirement and Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net periodic benefit cost [Abstract]        
Net periodic benefit expense     $ 57 $ 1,492
Non-qualified pension plan payments [Abstract]        
Non-qualified pension plan payments     229 12,659
Estimated remaining 2021 non-qualified pension plan payments $ 100   100  
Pension Plan [Member]        
Net periodic benefit cost [Abstract]        
Service cost 0 $ 167 0 501
Interest cost 24 1,474 71 4,420
Expected return on plan assets 0 (1,374) 0 (4,120)
Amortization of actuarial (gain) loss (5) 202 (14) 605
Plan settlement loss 0 0 0 86
Net periodic benefit expense $ 19 $ 469 $ 57 $ 1,492