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Retirement Plans and Other Postretirement Benefits - Fair Value of Plan Assets (Details) - Defined Benefit Plan - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount $ 21,945 $ 23,164 $ 22,090 $ 25,843
Equity security funds, United States        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 4,367 8,883    
Equity security funds, International        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 4,351 2,214    
Fixed income funds        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 13,059 11,116    
Short-term investment funds        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 168 951    
Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 168 951    
Level 1 | Equity security funds, United States        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 0 0    
Level 1 | Equity security funds, International        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 0 0    
Level 1 | Fixed income funds        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 0 0    
Level 1 | Short-term investment funds        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 168 951    
Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 21,777 22,213    
Level 2 | Equity security funds, United States        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 4,367 8,883    
Level 2 | Equity security funds, International        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 4,351 2,214    
Level 2 | Fixed income funds        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 13,059 11,116    
Level 2 | Short-term investment funds        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 0 0    
Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 0 0    
Level 3 | Equity security funds, United States        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 0 0    
Level 3 | Equity security funds, International        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 0 0    
Level 3 | Fixed income funds        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount 0 0    
Level 3 | Short-term investment funds        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets amount $ 0 $ 0