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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Par Value | $ 260,000 | $ 260,000
Unamortized Debt Issuance Cost and Discount | $ (3,559) | (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 | $ (1,255) | (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 | $ (2,304) | $ (2,394)

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