LONG-TERM DEBT - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 03, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Gross, long-term debt	$ 338,822
Less: Debt issuance costs, net	(3,855)		$ (3,158)
Less: Unamortized discount, net	(3,491)		(1,142)
Net long-term debt	331,476		409,281
Less: Current portion	0		(5,945)
Long-term debt, less current portion	331,476		403,336
Senior secured term loans
Debt Instrument [Line Items]
Gross, long-term debt	$ 338,822	$ 412,100	$ 413,581

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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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. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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