OTHER NON-CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Jan. 01, 2019
Other Liabilities Disclosure [Abstract]
Operating lease liabilities	$ 13,737	$ 19,707	$ 28,800
Income tax liabilities	12,026	10,935
Other non-current liabilities	528	374
Total	$ 26,291	$ 31,016