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CORPORATE BORROWINGS - Indebtedness Outstanding Summary (Details) - USD ($)
Dec. 31, 2021
Nov. 16, 2021
Dec. 31, 2020
Dec. 31, 2018
Debt Instrument [Line Items]        
Long-term debt, gross $ 239,853,000   $ 40,000,000  
Unamortized loan fees (6,454,000)   (129,000)  
Total indebtedness outstanding, net 233,399,000   39,871,000  
Less current maturities of long-term debt (3,227,000)   (1,600,000)  
Long-term debt $ 230,172,000   38,271,000  
Credit Agreement | Revolver        
Debt Instrument [Line Items]        
Credit Agreement, interest rate 1.10%      
Credit Agreement | Revolver | Revolving Credit Agreement, Due 2025        
Debt Instrument [Line Items]        
Long-term debt, gross $ 0   0  
Credit Agreement, interest rate 1.09%      
Convertible Debt | Convertible Note 1.88% Due 2041        
Debt Instrument [Line Items]        
Long-term debt, gross $ 201,250,000   0  
Unamortized loan fees $ (6,344,000)      
Senior secured notes, stated interest rate 1.88% 1.875%    
Secured Debt | Note Purchase Agreement Due 2027        
Debt Instrument [Line Items]        
Long-term debt, gross $ 18,400,000   20,000,000  
Senior secured notes, stated interest rate 3.53%     3.50%
Secured Debt | Note Purchase Agreement Due 2029        
Debt Instrument [Line Items]        
Long-term debt, gross $ 20,000,000   20,000,000  
Senior secured notes, stated interest rate 3.80%      
Other long-term borrowings        
Debt Instrument [Line Items]        
Long-term debt, gross $ 203,000   $ 0