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STOCKHOLDERS' EQUITY (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Accumulated Other Comprehensive Income The following is a summary of our accumulated other comprehensive loss:
 
As of March 31, 2019
 
As of December 31, 2018
 
(In thousands)
Foreign currency translation
$
(51,189
)
 
$
(55,016
)
Accumulated unrealized gain on marketable debt securities
25,037

 
15,746

Derivative instruments
14,087

 
19,688

Total accumulated other comprehensive loss
$
(12,065
)
 
$
(19,582
)