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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Par Value $ 175,000 $ 175,000
Unamortized Debt Issuance Cost and Discount $ (1,377) $ (1,579)
Senior Notes | 5.25% Senior Notes Due April 15, 2025    
Debt Instrument [Line Items]    
Stated interest rate 5.25% 5.25%
Par Value $ 175,000 $ 175,000
Unamortized Debt Issuance Cost and Discount $ (1,377) $ (1,579)