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Financial Instruments (Narrative) (Details)
9 Months Ended
Sep. 30, 2023
USD ($)
Aug. 16, 2023
USD ($)
Jun. 23, 2023
Oct. 27, 2020
USD ($)
Sep. 30, 2023
USD ($)
Sep. 18, 2023
USD ($)
Aug. 31, 2023
USD ($)
Jun. 29, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 17, 2022
USD ($)
Jun. 14, 2021
USD ($)
Debt Instrument [Line Items]                      
Maximum leverage ratio allowed 3.50 3.75     3.50            
Maximum leverage ratio allowed, after significant acquisition   425.00%                  
Minimum interest coverage ratio required   3.00                  
Leverage ratio 1.48       1.48            
Interest coverage ratio 13.95       13.95            
Long-term debt $ 490,585,000       $ 490,585,000       $ 439,000,000    
Current maturities of long-term debt 27,246,000       27,246,000       0    
Line of Credit                      
Debt Instrument [Line Items]                      
Long-term debt 461,000,000       461,000,000       439,000,000    
Line of Credit | Unsecured Debt                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity   $ 800,000,000   $ 700,000,000              
Debt instrument, term   5 years   4 years              
Borrowings outstanding 461,000,000       461,000,000            
Line of credit facility, remaining borrowing capacity $ 339,000,000       339,000,000            
Debt covenant, maximum annual dividend payout amount         40,000,000            
Line of Credit | SOFR | Minimum | Unsecured Debt                      
Debt Instrument [Line Items]                      
Total spread     0.00%                
Line of Credit | London Interbank Offered Rate | Unsecured Debt                      
Debt Instrument [Line Items]                      
Total spread 1.625%                    
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%   0.7683%   2.11% 0.838%
All-in interest SOFR rate           2.51%          
All-in interest rate                   3.735%  
Foreign Bank Debt                      
Debt Instrument [Line Items]                      
Long-term debt $ 29,585,000       29,585,000       $ 0    
Foreign Bank Debt | Heimbach                      
Debt Instrument [Line Items]                      
Long-term debt 29,600,000       29,600,000   $ 32,700,000        
Current maturities of long-term debt $ 27,200,000       $ 27,200,000            
Foreign Bank Debt | Minimum | Heimbach                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage             0.90%        
Foreign Bank Debt | Maximum | Heimbach                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage             2.93%