FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Apr. 03, 2018
Assets, Fair Value Disclosure
Cash and cash equivalents	$ 51,509	$ 58,294
Restricted cash	3,915	5,752
Investment in equity securities	38,419	36,181
Level 1 \| Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure
Cash and cash equivalents	51,509	58,294
Restricted cash	3,915	5,752
Investment in equity securities	38,419	36,181
Long-term receivable	0	0
Level 2 \| Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure
Cash and cash equivalents	0	0
Restricted cash	0	0
Investment in equity securities	0	0
Long-term receivable	0	0
Level 3 \| Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure
Cash and cash equivalents	0	0
Restricted cash	0	0
Investment in equity securities	0	0
Long-term receivable	2,258	2,221
Prior senior secured term loan
Liabilities, Fair Value Disclosure
Long-term debt, carrying amount	338,822	338,822	$ 412,100
Prior senior secured term loan \| Level 1 \| Fair Value, Measurements, Recurring
Liabilities, Fair Value Disclosure
Long-term debt, fair value	0	0
Prior senior secured term loan \| Level 2 \| Fair Value, Measurements, Recurring
Liabilities, Fair Value Disclosure
Long-term debt, fair value	328,657	330,351
Prior senior secured term loan \| Level 3 \| Fair Value, Measurements, Recurring
Liabilities, Fair Value Disclosure
Long-term debt, fair value	$ 0	$ 0

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Amount of investments in equity securities and other forms of securities that provide ownership interests classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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