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Credit Facility and Acquisition Debt (Narrative) (Details)
3 Months Ended 9 Months Ended
Jul. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
Sep. 30, 2024
USD ($)
Sep. 30, 2023
Dec. 31, 2023
USD ($)
Debt Covenant To Actual Ratios [Line Items]            
Revolving credit facility present accordion provisions   $ 75,000,000.0   $ 75,000,000.0    
Line of Credit | Prime Rate Option            
Debt Covenant To Actual Ratios [Line Items]            
Debt instrument, basis spread on variable rate       1.50%    
Line of Credit | Libor Margin Option            
Debt Covenant To Actual Ratios [Line Items]            
Debt instrument, basis spread on variable rate       2.60%    
Revolving Credit Facility, Secured, Floating Rate            
Debt Covenant To Actual Ratios [Line Items]            
Number of credit facilities outstanding   1   1    
Deferred payments   $ 2,600,000   $ 2,600,000    
Revolving Credit Facility | Credit Agreement 2018            
Debt Covenant To Actual Ratios [Line Items]            
Long-term debt   $ 140,000,000.0   $ 140,000,000.0   $ 179,100,000
Minimum | Deferred Purchase Price Notes            
Debt Covenant To Actual Ratios [Line Items]            
Debt instrument, imputed interest rate   6.50%   6.50%    
Debt instrument, term   9 years        
Maximum | Deferred Purchase Price Notes            
Debt Covenant To Actual Ratios [Line Items]            
Debt instrument, imputed interest rate   7.30%   7.30%    
Debt instrument, term   20 years        
Ratio Actual            
Debt Covenant To Actual Ratios [Line Items]            
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)   5.25   5.25    
Letter of Credit            
Debt Covenant To Actual Ratios [Line Items]            
Revolving credit facility, maximum borrowing capacity   $ 15,000,000.0   $ 15,000,000.0    
Swingline            
Debt Covenant To Actual Ratios [Line Items]            
Revolving credit facility, maximum borrowing capacity   10,000,000.0   10,000,000.0    
Revolving Credit Facility | Revolving Credit Facility, Secured, Floating Rate | Line of Credit            
Debt Covenant To Actual Ratios [Line Items]            
Remaining borrowing capacity   $ 107,400,000   $ 107,400,000    
Revolving Credit Facility | Revolving Credit Facility, Secured, Floating Rate | Credit Agreement            
Debt Covenant To Actual Ratios [Line Items]            
Debt instrument, interest rate during period   8.50% 9.00% 8.70% 8.50%  
Revolving Credit Facility | Ratio Actual | Revolving Credit Facility, Secured, Floating Rate | Line of Credit            
Debt Covenant To Actual Ratios [Line Items]            
Ratio of earnings to fixed cost obligations (in Ratio)   1.20   1.20    
Line of Credit            
Debt Covenant To Actual Ratios [Line Items]            
Revolving credit facility, maximum borrowing capacity   $ 250,000,000.0   $ 250,000,000.0    
Revolving credit facility, transaction costs capitalized $ 800,000