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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Components of accumulated other comprehensive loss:    
Accumulated net unrealized loss on available-for-sale securities $ 89 $ 841
Foreign currency translation adjustments, net of tax 32,775 15,818
Total accumulated other comprehensive loss $ 32,864 $ 16,659