OTHER NON-CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Lease obligation liabilities	$ 19,350	$ 28,800	$ 0
Income tax liabilities	7,151		7,069
Deferred revenue	78		19
Other non-current liabilities	423		2,090
Total	$ 27,002		$ 9,178