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Credit Arrangements - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 15, 2021
Sep. 13, 2018
Aug. 03, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Sep. 29, 2017
Credit arrangements                
Weighted average interest rate (as a percent)       2.80% 3.70%      
Unamortized Debt Issuance Expense       $ 4,198 $ 521      
Repayments of Long-term Debt       113,851 68,884 $ 72,077    
Aggregate principal amount       $ 661,462 $ 316,557      
Interest rate swap                
Credit arrangements                
Interest rate swap agreement   75.00%            
Revolving Credit Facility                
Credit arrangements                
Maximum borrowing capacity $ 200,000              
Potential increase per the agreement 75,000              
Commercial letters of credit                
Credit arrangements                
Maximum borrowing capacity $ 200,000              
Mortgages | Minimum                
Credit arrangements                
Interest rate (as a percent)       4.21%        
Mortgages | Maximum                
Credit arrangements                
Interest rate (as a percent)       4.50%        
Commercial Equipment Notes | Minimum                
Credit arrangements                
Interest rate (as a percent)       1.60%        
Commercial Equipment Notes | Maximum                
Credit arrangements                
Interest rate (as a percent)       4.40%        
Credit Agreement                
Credit arrangements                
Potential increase per the agreement     $ 75,000          
Unamortized Debt Issuance Expense             $ 4,700  
Percentage of credit agreement, threshold restriction of total assets 20.00%              
Prepayment to be paid on debt $ 5,000              
Borrowings outstanding       $ 0        
Available borrowing capacity       158,000        
Credit Agreement | Federal funds rate                
Credit arrangements                
Basis spread on variable rate (as a percent) 0.50%              
Credit Agreement | Revolving Credit Facility                
Credit arrangements                
Maximum borrowing capacity               $ 200,000
Credit Agreement | Commercial letters of credit                
Credit arrangements                
Maximum borrowing capacity               $ 200,000
Letters of credit outstanding       42,000        
Term Loan                
Credit arrangements                
Principal amount     $ 220,000          
Quarterly principal payment $ 7,400              
Interest rate swap agreement   75.00%            
Derivative fixed interest rate (as a percent)   2.89%            
Repayments of Long-term Debt       $ 42,600        
Increases of term loan 400,000              
Aggregate principal amount $ 592,500              
Term Loan | LIBOR                
Credit arrangements                
Basis spread on variable rate (as a percent)       2.00%