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LONG-TERM DEBT - New and Old Term Loan Credit Agreement Narrative (Details) - USD ($)		3 Months Ended	12 Months Ended
	Sep. 28, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Loss on debt extinguishment			$ 396,000	$ 165,000	$ 280,000
Interest paid			23,411,000	26,234,000	27,386,000
Principal payments under term loan credit facility			146,393,000	50,470,000	1,880,000
Notes Payable, Other Payables | New Term Loan Credit Agreement
Debt Instrument [Line Items]
Debt instrument, face amount	$ 150,000,000.0
Percentage of tranche loan amount on equal quarterly installments	0.25%
Debt instrument, LIBOR floor rate	0.75%
Proceeds from issuance of long-term debt	$ 148,500,000
Notes Payable, Other Payables | Old Term Loan Credit Agreement
Debt Instrument [Line Items]
Payment of principal		$ 135,200,000
Loss on debt extinguishment		200,000
Term Loan Credit Agreement | Senior Secured Credit Facility
Debt Instrument [Line Items]
Loss on debt extinguishment		200,000	400,000	200,000	300,000
Repayments of long-term debt			11,200,000
Interest paid			4,800,000	7,800,000	8,000,000.0
Principal payments under term loan credit facility				50,500,000	1,900,000
Long-term line of credit		138,800,000	138,800,000	135,200,000
Line of credit, current		$ 0	0	0
Amortization of debt issuance costs and discounts			$ 200,000	$ 200,000	$ 200,000
London Interbank Offered Rate (LIBOR) | Notes Payable, Other Payables | New Term Loan Credit Agreement
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.25%
Base Rate | Notes Payable, Other Payables | New Term Loan Credit Agreement
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.25%

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- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Gross amount of debt extinguished.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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