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Financial Instruments (Narrative) (Details)
 6 Months Ended
Jun. 30, 2024
USD ($)
Aug. 16, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 17, 2024
Dec. 31, 2023
USD ($)
Aug. 31, 2023
USD ($)
Jun. 29, 2023
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]                
Maximum leverage ratio allowed 3.50 3.75 3.50          
Maximum leverage ratio allowed, after significant acquisition   4.25            
Minimum interest coverage ratio required   3.00            
Leverage ratio 0.98   0.98          
Interest coverage ratio 14.70   14.70          
Long-term debt $ 377,057,000   $ 377,057,000   $ 456,885,000      
Current maturities of long-term debt 2,732,000   2,732,000   4,218,000      
Line of Credit                
Debt Instrument [Line Items]                
Long-term debt 370,000,000   370,000,000   446,000,000      
Line of Credit | Interest rate swaps                
Debt Instrument [Line Items]                
Derivative, notional amount $ 350,000,000   $ 350,000,000       $ 350,000,000 $ 350,000,000
Derivative, fixed interest rate       5.33%     0.88%  
All-in interest SOFR rate 2.51%   2.51%          
Foreign bank debt                
Debt Instrument [Line Items]                
Long-term debt $ 7,057,000   $ 7,057,000   10,885,000      
Foreign bank debt | Heimbach                
Debt Instrument [Line Items]                
Long-term debt 7,100,000   7,100,000   10,900,000 $ 32,700,000    
Current maturities of long-term debt $ 2,700,000   2,700,000   $ 4,200,000      
Unsecured Debt | Line of Credit                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   $ 800,000,000            
Debt instrument, term   5 years            
Total spread 1.625%              
Borrowings outstanding $ 370,000,000   370,000,000          
Line of credit facility, remaining borrowing capacity $ 430,000,000   430,000,000          
Debt covenant, maximum annual dividend payout amount     $ 40,000,000