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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, 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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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) more than one year from the balance sheet date. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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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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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 03, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	$ 58,294		$ 105,006
Restricted cash	5,752		3,837	$ 4,127
Investment in equity securities	36,181		49,153
Long-term receivable (Note 4)	2,221		0
Liabilities, Fair Value Disclosure [Abstract]
Senior secured term loan, carrying value	338,822
Senior secured term loan
Liabilities, Fair Value Disclosure [Abstract]
Senior secured term loan, carrying value	338,822	$ 412,100	413,581
Fair Value, Level 1 \| Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	58,294		105,006
Restricted cash	5,752		3,837
Investment in equity securities	36,181		49,153
Long-term receivable (Note 4)	0		0
Fair Value, Level 1 \| Fair Value, Measurements, Recurring \| Senior secured term loan
Liabilities, Fair Value Disclosure [Abstract]
Senior secured term loan, fair value	0		0
Fair Value, Level 2 \| Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0		0
Restricted cash	0		0
Investment in equity securities	0		0
Long-term receivable (Note 4)	0		0
Fair Value, Level 2 \| Fair Value, Measurements, Recurring \| Senior secured term loan
Liabilities, Fair Value Disclosure [Abstract]
Senior secured term loan, fair value	330,351		407,377
Fair Value, Level 3 \| Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0		0
Restricted cash	0		0
Investment in equity securities	0		0
Long-term receivable (Note 4)	2,221		0
Fair Value, Level 3 \| Fair Value, Measurements, Recurring \| Senior secured term loan
Liabilities, Fair Value Disclosure [Abstract]
Senior secured term loan, fair value	$ 0		$ 0