FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Cash and cash equivalents	$ 79,098	$ 82,741
Restricted cash	3,810	3,842
Investment in equity securities	41,271	42,618
Short-term receivable (Note 3)	2,410	0
Long-term receivable (Note 3)	0	2,371
Level 1 | Fair Value, Measurements, Recurring
Assets:
Cash and cash equivalents	79,098	82,741
Restricted cash	3,810	3,842
Investment in equity securities	41,271	42,618
Short-term receivable (Note 3)	0	0
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
Short-term receivable (Note 3)	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
Short-term receivable (Note 3)	2,410	0
Long-term receivable (Note 3)	0	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	220,370	277,666
Senior secured term loan | Level 3 | Fair Value, Measurements, Recurring
Liabilities:
Senior secured term loan	$ 0	$ 0