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Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss

The following table summarizes the changes in accumulated other comprehensive loss, net of tax, which is reported as a component of stockholders' equity, for the six months ended June 30, 2018 (in thousands):

 
Foreign Currency Translation
 
Net Unrealized Gains (Losses) on Investments
 
Total
Balance as of January 1, 2018
$
(24,319
)
 
$
2,389

 
$
(21,930
)
Other comprehensive loss
(18,275
)
 
(1,765
)
 
(20,040
)
Balance as of June 30, 2018
$
(42,594
)
 
$
624

 
$
(41,970
)


Amounts reclassified from accumulated other comprehensive loss to net income were insignificant for the six months ended June 30, 2018.