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DEBT - Senior Notes (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Sep. 26, 2017 | Mar. 31, 2021 | Mar. 31, 2020
Debt Instrument [Line Items] |  |  |
Interest expense |  | $ 6,150,000 | $ 6,272,000
Senior Notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Notes issued, aggregate principal amount | $ 325,000,000 |  |
Notes issued, interest rate | 5.50% |  |
Proceeds from issuance of senior long-term debt | $ 318,900,000 |  |
Interest expense |  | $ 4,500,000 | $ 4,600,000

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