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Retirement and Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net periodic benefit cost [Abstract]        
Net periodic benefit expense     $ 38 $ 1,023
Non-qualified pension plan payments [Abstract]        
Non-qualified pension plan payments     153 1,062
Estimated remaining 2021 non-qualified pension plan payments $ 200   200  
Pension Plan [Member]        
Net periodic benefit cost [Abstract]        
Service cost 0 $ 166 0 334
Interest cost 23 1,473 47 2,946
Expected return on plan assets 0 (1,372) 0 (2,746)
Amortization of actuarial (gain) loss (4) 201 (9) 403
Plan settlement loss 0 0 0 86
Net periodic benefit expense $ 19 $ 468 $ 38 $ 1,023