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STOCKHOLDERS' EQUITY - Summary of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Equity [Abstract]    
Foreign currency translation $ (66,786) $ (55,016)
Accumulated unrealized gain on available for sale securities 19,480 15,746
Derivative instruments (12,551) 19,688
Total accumulated other comprehensive loss $ (59,857) $ (19,582)