OTHER NON-CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jan. 01, 2019
Other Liabilities Disclosure [Abstract]
Operating lease liabilities	$ 15,024	$ 19,707	$ 28,800
Income tax liabilities	10,552	10,935
Other non-current liabilities	442	374
Total	$ 26,018	$ 31,016