FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Apr. 03, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term Debt, Gross	$ 293,826
Assets:
Cash and cash equivalents	82,741	$ 58,294
Restricted cash	3,842	5,752
Investment in equity securities	42,618	36,181
Long-term receivable (Note 4)	2,371	2,221
Senior secured term loan
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term Debt, Gross	293,826	338,822	$ 412,100
Liabilities:
Senior secured term loan	293,826
Level 1 \| Fair Value, Measurements, Recurring
Assets:
Cash and cash equivalents	82,741	58,294
Restricted cash	3,842	5,752
Investment in equity securities	42,618	36,181
Long-term receivable (Note 4)	0	0
Level 1 \| Fair Value, Measurements, Recurring \| Senior secured term loan
Liabilities:
Senior secured term loan	0	0
Level 2 \| Fair Value, Measurements, Recurring
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Investment in equity securities	0	0
Long-term receivable (Note 4)	0	0
Level 2 \| Fair Value, Measurements, Recurring \| Senior secured term loan
Liabilities:
Senior secured term loan	277,666	330,351
Level 3 \| Fair Value, Measurements, Recurring
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Investment in equity securities	0	0
Long-term receivable (Note 4)	2,371	2,221
Level 3 \| Fair Value, Measurements, Recurring \| Senior secured term loan
Liabilities:
Senior secured term loan	$ 0	$ 0

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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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