OTHER NON-CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Lease obligation liabilities	$ 23,202	$ 28,800	$ 0
Income tax liabilities	7,109		7,069
Deferred revenue	52		19
Other non-current liabilities	404		2,090
Total	$ 30,767		$ 9,178