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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents [abstract]      
Cash $ 209,518 $ 131,589  
Short-term investments 209,694 328,275  
Cash and cash equivalents $ 419,212 $ 459,864 $ 327,127