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CORPORATE BORROWINGS - Narrative (Details)
$ in Thousands
12 Months Ended
Nov. 16, 2021
USD ($)
day
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2023
USD ($)
Aug. 23, 2023
USD ($)
Jun. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
May 14, 2021
USD ($)
Feb. 14, 2020
USD ($)
Apr. 30, 2019
Debt Instrument [Line Items]                    
Unamortized loan fees       $ 6,601     $ 6,115      
Total indebtedness outstanding       293,850     236,450      
Credit Agreement Due 2025                    
Debt Instrument [Line Items]                    
Credit agreement - revolver               $ 400,000 $ 300,000  
Credit Agreement                    
Debt Instrument [Line Items]                    
New loan fees       0            
Unamortized loan fees       824            
Note Purchase Agreement                    
Debt Instrument [Line Items]                    
Unamortized loan fees       71            
Secured Debt | Note Purchase Agreement                    
Debt Instrument [Line Items]                    
New loan fees       0            
Term loan face amount               20    
Secured Debt | Series A Senior Secured Notes, 3.53% (fixed rate) due 2027                    
Debt Instrument [Line Items]                    
Total indebtedness outstanding       $ 12,000     15,200      
Proceeds from issuance of debt     $ 20,000              
Senior secured notes, stated interest rate     3.53% 3.53%            
Secured Debt | Senior Secured Notes, 3.80% (fixed rate) due 2029                    
Debt Instrument [Line Items]                    
Total indebtedness outstanding       $ 17,600     20,000      
Proceeds from issuance of debt   $ 20,000                
Senior secured notes, stated interest rate                   3.80%
Convertible Debt | Convertible Note, 1.88% (fixed rate) due 2041                    
Debt Instrument [Line Items]                    
New loan fees       0            
Unamortized loan fees       5,706            
Total indebtedness outstanding       $ 201,250     201,250      
Proceeds from issuance of debt $ 201,250                  
Senior secured notes, stated interest rate 1.88%     1.88%            
Conversion ratio 10.3911                  
Threshold of trading days | day 20                  
Threshold of consecutive trading days | day 30                  
Threshold percentage 130.00%                  
Threshold of business day | day 5                  
Threshold period | day 10                  
Measurement percentage 0.98                  
Convertible Debt | Convertible Note, 1.88% (fixed rate) due 2041 | Initial Purchasers                    
Debt Instrument [Line Items]                    
Proceeds from issuance of debt $ 26,250                  
Revolver | Credit Agreement                    
Debt Instrument [Line Items]                    
Contingent increase in borrowing capacity               100,000    
Remaining borrowing capacity       $ 337,000            
Credit Agreement, interest rate       6.46%            
Revolver | Credit Agreement | Credit Agreement - Revolver, 6.46% (variable rate) due 2026                    
Debt Instrument [Line Items]                    
Total indebtedness outstanding       $ 63,000   $ 105,000 $ 0      
Credit Agreement, interest rate       6.46%            
Revolver | Secured Debt | Note Purchase Agreement                    
Debt Instrument [Line Items]                    
Remaining borrowing capacity       $ 220,400            
Term loan face amount         $ 250     $ 105