INTANGIBLE AND OTHER ASSETS - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Costs to obtain a contract	$ 1,976	$ 2,018	$ 2,018
Long-term prepaid licenses and royalties	5,037	5,209
Business economic loss claim receivable (see Note 10 for further discussion)	0	3,684
International tax receivables	800	840
Investments in businesses	2,089	2,089
Other long-term assets	535	1,337
Other assets	$ 10,437	$ 15,177