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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Par Value $ 260,000 $ 260,000
Unamortized Debt Issuance Cost and Discount $ (3,294) (3,685)
Senior Notes | 5.25% senior notes due April 15, 2025    
Debt Instrument [Line Items]    
Stated interest rate 5.25%  
Par Value $ 175,000 175,000
Unamortized Debt Issuance Cost and Discount $ (1,104) (1,291)
Senior Notes | 4.375% subordinated notes due October 30, 2030    
Debt Instrument [Line Items]    
Stated interest rate 4.375%  
Subordinated Notes | 4.375% subordinated notes due October 30, 2030    
Debt Instrument [Line Items]    
Par Value $ 85,000 85,000
Unamortized Debt Issuance Cost and Discount $ (2,190) $ (2,394)