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Employee Benefit Plans (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
employee
plan
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of defined benefit plans | plan 4    
401 (k) plan cost recognized $ 1,473 $ 1,465 $ 1,350
Hourly Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Period for amortization of benefit plan gains and losses 12 years 4 months 20 days    
Salaried Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Period for amortization of benefit plan gains and losses 11 years 7 months 9 days    
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Number of defined benefit plans | plan 4    
2022 $ 6,347    
2023 5,993    
2024 5,648    
2025 5,289    
2026 64,060    
2027 - 2031 $ 26,666    
Ten-year rate of return 7.74% 6.91% 7.59%
Five-year rate of return 7.86% 7.51% 5.41%
Pension Benefits | Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Number of defined benefit plans | plan 2    
Pension Benefits | Nonqualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Number of defined benefit plans | plan 2    
Supplemental Employee Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Age requirement for participant 60 years    
Required employment period 8 years    
2022 $ 0    
2023 0    
2024 0    
2025 0    
2026 59,116    
2027 - 2031 6,866    
Supplemental Employee Retirement Plan | President and Chief Executive Officer      
Defined Benefit Plan Disclosure [Line Items]      
Additional benefit $ 1,788    
Service period credit upon termination 36 months    
Postretirement Medical      
Defined Benefit Plan Disclosure [Line Items]      
2022 $ 621    
2023 627    
2024 629    
2025 606    
2026 590    
2027 - 2031 $ 2,596    
Employee contribution percentage 100.00%    
Number of retired employees | employee 74    
Postretirement Life Insurance      
Defined Benefit Plan Disclosure [Line Items]      
Number of retired employees | employee 349    
Number of active employees | employee 89