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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of the required periodic payments applied to principal.

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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 Instrument, Interest Rate, Floor

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Line of Credit Facility Accordion Feature Increase Limit

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Percentage of tranche loan amount on equal quarterly installments

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DEBT Term Loan Credit Agreement (Details)		3 Months Ended
DEBT Term Loan Credit Agreement (Details)	Nov. 17, 2017 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	May 31, 2012 USD ($)
Debt Instrument [Line Items]
Interest paid		$ 2,200,000	$ 1,800,000
Line of credit facility, periodic payment, principal		500,000	500,000
Amortization of debt issuance costs and discounts		100,000	$ 100,000
Term Loan Credit Agreement
Debt Instrument [Line Items]
Long-term line of credit		185,200,000
Percentage of tranche loan amount on equal quarterly installments	0.25%
Debt instrument, periodic payment, principal		$ 1,900,000
Term Loan Credit Agreement \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Long-term line of credit	$ 188,000,000			$ 188,000,000.0
Line of credit facility accordion feature increase limit				$ 75,000,000
Debt instrument, covenant, secured leverage ratio				3.00
Term Loan Credit Agreement \| Senior Secured Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument floor interest rate	0.00%
Debt instrument, basis spread on variable rate	2.25%
Term Loan Credit Agreement \| Senior Secured Credit Facility \| Base Rate
Debt Instrument [Line Items]
Debt instrument floor interest rate	0.00%
Debt instrument, basis spread on variable rate	1.25%