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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Summary of Changes in Accumulated Other Comprehensive Loss
The following table is a summary of changes in accumulated other comprehensive loss by component (in thousands):
 
 
Foreign currency translation adjustments
 
Total
Accumulated other comprehensive loss at December 31, 2017
 
$
(18,879
)
 
$
(18,879
)
Net current-period other comprehensive income
 
1,825

 
1,825

Accumulated other comprehensive loss at March 31, 2018
 
$
(17,054
)
 
$
(17,054
)