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CORPORATE BORROWINGS - Narrative (Details)
12 Months Ended
Nov. 16, 2021
USD ($)
d
Apr. 30, 2019
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2017
USD ($)
Jul. 29, 2021
USD ($)
Jul. 28, 2021
USD ($)
May 14, 2021
USD ($)
Feb. 14, 2020
USD ($)
Debt Instrument [Line Items]                    
Proceeds from credit agreement - revolver     $ 0 $ 242,300,000 $ 54,700,000          
Unamortized loan fees     6,115,000 6,454,000            
Long-term debt, gross     236,450,000 239,853,000            
Credit Agreement Due 2025                    
Debt Instrument [Line Items]                    
Credit agreement - revolver                 $ 400,000,000 $ 300,000,000
Credit Agreement                    
Debt Instrument [Line Items]                    
New loan fees     0              
Unamortized loan fees     1,177,000              
Note Purchase Agreement                    
Debt Instrument [Line Items]                    
Unamortized loan fees     90,000              
Secured Debt | Note Purchase Agreement                    
Debt Instrument [Line Items]                    
New loan fees     0              
Term loan face amount                 20,000  
Secured Debt | Note Purchase Agreement Due 2027                    
Debt Instrument [Line Items]                    
Long-term debt, gross     $ 15,200,000 18,400,000            
Proceeds from issuance of debt           $ 20,000,000        
Senior secured notes, stated interest rate     3.53%     3.53%        
Secured Debt | Note Purchase Agreement Due 2029                    
Debt Instrument [Line Items]                    
Long-term debt, gross     $ 20,000,000 20,000,000            
Proceeds from issuance of debt   $ 20,000,000                
Senior secured notes, stated interest rate     3.80%              
Convertible Debt | Convertible Note 1.88% Due 2041                    
Debt Instrument [Line Items]                    
New loan fees     $ 0              
Unamortized loan fees     6,025,000              
Long-term debt, gross     $ 201,250,000 201,250,000            
Proceeds from issuance of debt $ 201,250,000                  
Senior secured notes, stated interest rate 1.88%   1.88%              
Conversion ratio 10.3911                  
Threshold of trading days | d 20                  
Threshold of consecutive trading days | d 30                  
Threshold percentage 130.00%                  
Threshold of business day | d 5                  
Threshold period | d 10                  
Measurement percentage 0.98                  
Convertible Debt | Convertible Note 1.88% Due 2041 | Initial Purchasers                    
Debt Instrument [Line Items]                    
Proceeds from issuance of debt $ 26,250,000                  
Revolver | Credit Agreement                    
Debt Instrument [Line Items]                    
Contingent increase in borrowing capacity                 100,000,000  
Remaining borrowing capacity     $ 400,000,000              
Credit Agreement, interest rate     5.46%              
Revolver | Credit Agreement | Revolving Credit Agreement, Due 2025                    
Debt Instrument [Line Items]                    
Long-term debt, gross     $ 0 $ 0            
Credit Agreement, interest rate     5.46%              
Revolver | Secured Debt | Note Purchase Agreement                    
Debt Instrument [Line Items]                    
Remaining borrowing capacity     $ 120,000,000              
Term loan face amount             $ 140,000 $ 105,000 $ 105,000