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LONG-TERM DEBT - Term Loan Credit Agreement Narrative (Details)		12 Months Ended
	Nov. 17, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Feb. 24, 2017 USD ($)	May 31, 2012 USD ($)
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 165,000	$ 280,000	$ 799,000
Amortization of debt issuance costs and discounts		200,000	200,000	200,000
Amended Credit Agreement
Debt Instrument [Line Items]
Interest paid, including capitalized interest, operating and investing activities		7,800,000	8,000,000.0	7,400,000
Long-term debt		50,500,000	1,900,000	1,900,000
Loss on debt extinguishment		200,000		$ 700,000
Term Loan Credit Agreement
Debt Instrument [Line Items]
Long-term line of credit		135,200,000	185,700,000
Debt instrument, periodic payment, principal		$ 0	$ 1,900,000
Term Loan Credit Agreement | Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount						$ 188,000,000.0
Line of credit facility accordion feature increase limit						$ 75,000,000
Debt instrument, covenant, secured leverage ratio						3.00
Long-term line of credit	$ 188,000,000.0				$ 189,500,000
London Interbank Offered Rate (LIBOR) | Term Loan Credit Agreement | Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.25%
Base Rate | Term Loan Credit Agreement | Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.25%

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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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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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