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Corporate Borrowings - Indebtedness Outstanding (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Nov. 16, 2021
Debt Instrument [Line Items]      
Total indebtedness outstanding $ 235,650 $ 236,450  
Less unamortized loan fees (6,031) (6,115)  
Total indebtedness outstanding, net 229,619 230,335  
Less current maturities of long-term debt (6,400) (5,600)  
Long-term debt 223,219 224,735  
Credit Agreement - Revolver, 5.90% (variable rate) due 2026 | Line of Credit | Revolving Credit Facility      
Debt Instrument [Line Items]      
Total indebtedness outstanding $ 0 0  
Credit agreement, interest rate 5.90%    
Convertible Senior Notes, 1.88% (fixed rate) due 2041 | Convertible Debt      
Debt Instrument [Line Items]      
Total indebtedness outstanding $ 201,250 201,250  
Stated interest rate 1.88%   1.88%
Series A Senior Secured Notes, 3.53% (fixed rate) due 2027 | Secured Debt      
Debt Instrument [Line Items]      
Total indebtedness outstanding $ 14,400 15,200  
Stated interest rate 3.53%    
Senior Secured Notes, 3.80% (fixed rate) due 2029 | Secured Debt      
Debt Instrument [Line Items]      
Total indebtedness outstanding $ 20,000 $ 20,000  
Stated interest rate 3.80%