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STOCKHOLDERS' EQUITY - Summary of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Equity [Abstract]
Foreign currency translation	$ (59,775)	$ (55,016)
Accumulated unrealized gain on available for sale securities	22,642	15,746
Derivative instruments	(2,538)	19,688
Total accumulated other comprehensive loss	$ (39,671)	$ (19,582)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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