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DEBT - New and Old Term Loan Credit Agreements (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 28, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Current portion of long-term debt |  | $ 0 |  |  | $ 0 |  | $ 0
Loss on debt extinguishment |  | 500,000 |  |  | 452,000 | $ 219,000 |
Term Loan Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amortization of debt issuance costs and discounts |  | 100,000 |  | $ 100,000 | 200,000 | 100,000 |
New Term Loan Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 30,000,000 |  |  |  |
New Term Loan Credit Agreement | Term Loan Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes issued, aggregate principal amount | $ 150,000,000 |  |  |  |  |  |
Percentage of tranche loan amount on Equal quarterly installments | 0.25% |  |  |  |  |  |
Debt Instrument, LIBOR Floor Rate | 0.75% |  |  |  |  |  |
Current portion of long-term debt |  | 0 |  |  | 0 |  |
Interest paid |  | $ 1,100,000 |  |  |  |  |
New Term Loan Credit Agreement | London Interbank Offered Rate (LIBOR) | Term Loan Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 3.25% |  |  |  |  |  |
New Term Loan Credit Agreement | Base Rate | Term Loan Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.25% |  |  |  |  |  |
Old Term Loan Credit Agreement | Term Loan Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest paid |  |  |  | 900,000 | $ 3,800,000 | 3,300,000 |
Repayments of long-term debt |  |  |  | $ 135,200,000 |  | $ 135,200,000 |

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