LONG-TERM OBLIGATIONS - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal amount	$ 10,900	$ 90,700
Deferred debt issuance costs	(3,500)	(1,900)
Long-term obligations, including current portion	7,400	88,800
Current portion of long-term obligations	(1,612)	(10,638)
Long-term obligations, less current portion	5,775	78,203
Term Loan [Member] \| 100 Million Term Loan [Member]
Debt Instrument [Line Items]
Principal amount	0	90,000
Revolving Credit Facility [Member] \| Five Hundred Fifty Million Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal amount	7,500	0
Promissory Notes [Member]
Debt Instrument [Line Items]
Principal amount	1,100	700
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Principal amount	$ 2,300	$ 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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