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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