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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Components of accumulated other comprehensive loss:    
Accumulated net unrealized loss on available-for-sale securities $ 193  
Foreign currency translation adjustments, net of tax 23,056 $ 21,878
Total accumulated other comprehensive loss $ 23,249 $ 21,878