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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