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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Components of accumulated other comprehensive loss:    
Accumulated net unrealized (gain) loss on available-for-sale securities $ 194 $ (89)
Foreign currency translation adjustments, net of tax (32,581) (32,775)
Total accumulated other comprehensive loss $ (32,387) $ (32,864)