FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Cash and cash equivalents	$ 68,177	$ 82,741
Restricted cash	3,816	3,842
Investment in equity securities	30,047	42,618
Long-term receivable	2,436	2,371
Level 1 \| Fair Value, Measurements, Recurring
Assets:
Cash and cash equivalents	68,177	82,741
Restricted cash	3,816	3,842
Investment in equity securities	30,047	42,618
Long-term receivable	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 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	2,436	2,371
Senior secured term loan
Liabilities:
Senior secured term loan	293,826	293,826
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	214,493	277,666
Senior secured term loan \| Level 3 \| Fair Value, Measurements, Recurring
Liabilities:
Senior secured term loan	$ 0	$ 0

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