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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Components of accumulated other comprehensive loss:    
Balance at the beginning of the period $ 32,864 $ 16,659
Other comprehensive loss (income) before reclassifications 1,261 (2,938)
Net current-period other comprehensive loss (income) 1,261 (2,938)
Balance at the end of the period 34,125 13,721
Currency Translation Losses    
Components of accumulated other comprehensive loss:    
Balance at the beginning of the period 32,775 15,818
Other comprehensive loss (income) before reclassifications 1,381 (2,723)
Net current-period other comprehensive loss (income) 1,381 (2,723)
Balance at the end of the period 34,156 13,095
Unrealized (Gains) Losses on Available-for-Sale Securities    
Components of accumulated other comprehensive loss:    
Balance at the beginning of the period 89 841
Other comprehensive loss (income) before reclassifications (120) (215)
Net current-period other comprehensive loss (income) (120) (215)
Balance at the end of the period $ (31) $ 626