FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Apr. 03, 2018
Assets:
Cash and cash equivalents	$ 85,379	$ 58,294
Restricted cash	3,741	5,752
Investment in equity securities	43,730	36,181
Long-term receivable (Note 3)	2,295	2,221
Level 1 \| Fair Value, Measurements, Recurring
Assets:
Cash and cash equivalents	85,379	58,294
Restricted cash	3,741	5,752
Investment in equity securities	43,730	36,181
Long-term receivable (Note 3)	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 3)	0	0
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 3)	2,295	2,221
Senior secured term loan
Liabilities:
Senior secured term loan	333,012	338,822	$ 412,100
Senior secured term loan \| Level 1 \| Fair Value, Measurements, Recurring
Liabilities:
Senior secured term loan	0	0
Senior secured term loan \| Level 2 \| Fair Value, Measurements, Recurring
Liabilities:
Senior secured term loan	328,433	330,351
Senior secured term loan \| Level 3 \| Fair Value, Measurements, Recurring
Liabilities:
Senior secured term loan	$ 0	$ 0

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