DEBT - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total long-term debt	$ 634,000	$ 354,357
Less: Convertible Notes debt discount	(31,699)	0
Less: current maturities of long-term debt	(7,500)	(15,766)
Less: net deferred financing costs related to Term Loan	(467)	(480)
Total long-term debt, less current maturities, net	594,334	338,111
Line of Credit [Member]
Debt Instrument [Line Items]
Total long-term debt	364,000	287,397
Term Loan [Member]
Debt Instrument [Line Items]
Total long-term debt	97,500	66,960
Convertible Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 172,500	$ 0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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