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DEBT - Old Senior Notes (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 26, 2017 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |
Interest expense |  | $ 5,847,000 | $ 5,749,000 | $ 18,031,000 | $ 17,903,000
Senior Notes due 2025 | Old 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 | $ 13,500,000 | $ 13,900,000
Repayments of long-term debt |  | $ 10,000,000 |  |  |

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