FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Cash and cash equivalents	$ 58,263	$ 82,741
Restricted cash	3,833	3,842
Investment in equity securities	0	42,618
Long-term receivable	2,531	2,371
Senior secured term loan
Liabilities:
Senior secured term loan	247,204	293,826
Level 1 \| Fair Value, Measurements, Recurring
Assets:
Cash and cash equivalents	58,263	82,741
Restricted cash	3,833	3,842
Investment in equity securities	0	42,618
Long-term receivable	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	0	0
Level 2 \| Fair Value, Measurements, Recurring \| Senior secured term loan
Liabilities:
Senior secured term loan	201,472	277,666
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	2,531	2,371
Level 3 \| Fair Value, Measurements, Recurring \| Senior secured term loan
Liabilities:
Senior secured term loan	$ 0	$ 0

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