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

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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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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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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 of the required periodic payment applied to principal.

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Debt Instrument, Covenant, Secured Leverage Ratio

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DEBT - Term Loan Credit Agreement (Details)	3 Months Ended		6 Months Ended
DEBT - Term Loan Credit Agreement (Details)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Nov. 17, 2017 USD ($)	May 31, 2012 USD ($)
Debt Instrument [Line Items]
Interest paid	$ 2,200,000	$ 2,000,000.0	$ 4,400,000	$ 3,900,000
Line of credit facility, periodic payment, principal	15,000,000.0	500,000	15,500,000	900,000
Loss on debt extinguishment	100,000		53,000	174,000
Amortization of debt issuance costs and discounts	100,000	$ 100,000	100,000	$ 0
Term Loan Credit Agreement
Debt Instrument [Line Items]
Long-term line of credit	$ 170,200,000		$ 170,200,000
Term Loan Credit Agreement \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Long-term line of credit					$ 188,000,000.0	$ 188,000,000.0
Line of credit facility accordion feature increase limit						$ 75,000,000
Debt instrument, covenant, secured leverage ratio						3.00