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GOODWILL (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Change in goodwill    
Beginning balance $ 52,639 $ 29,531
Adjustment to or acquisition of goodwill (Note 2) 579 23,844
Effect of foreign currency translation (65) (736)
Ending balance $ 53,153 $ 52,639