Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans - Reconciliations (Details)

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Employee Retirement Plans - Reconciliations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Salaried Pension Plan      
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent $ 17,170 $ 15,804  
Pension cost      
Component of net periodic cost:      
Interest cost     $ 1,642
Expected return on plan assets     (1,175)
Amortization of net (gain) loss     595
Effect of settlement for termination     6,380
Net periodic pension cost     7,442
Employer contributions during the period     460
Change in projected benefit obligation:      
Benefit obligation at beginning of year     40,182
Actuarial (gain) loss     166
Benefits paid     (1,451)
Change in plan assets:      
Fair value of plan assets at beginning of year     38,053
Actual return on plan assets     3,477
Benefits paid     (1,451)
Pension settlement     (40,539)
Funded status at end of year    
Salaried Pension Plan      
Accumulated benefit obligation     0
Pension cost | Minimum      
Component of net periodic cost:      
Employer contributions during the period     0
Other postretirement benefit cost      
Component of net periodic cost:      
Service cost 137 147 149
Interest cost 137 191 252
Amortization of net (gain) loss (312) (310) (312)
Net periodic pension cost (38) 28 89
Change in projected benefit obligation:      
Benefit obligation at beginning of year 6,736 6,538  
Participant contributions 52 55  
Actuarial (gain) loss (790) (178)  
Benefits paid (11) (17)  
Benefit obligation at end of year 6,261 6,736 $ 6,538
Change in plan assets:      
Benefits paid $ (11) (17)  
Period of coverage under the plan 10 years    
Amounts recognized in the consolidated balance sheets consisted      
Accrued expenses and other current liabilities $ 230 250  
Amounts recognized in the consolidated balance sheets $ 6,261 6,736  
Salaried Pension Plan      
Period of service of employees 12 years    
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent $ 6,031 $ 6,486