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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 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
Accumulated other comprehensive loss at December 31, 2017
$
(18,879
)
Net current-period other comprehensive income
(712
)
Accumulated other comprehensive loss at September 30, 2018
$
(19,591
)
 
 

(a) 
Represents the impact of foreign currency translation adjustments, primarily due to the devaluation of the British Pound Sterling (“GBP”) on the Company’s GBP-denominated balances, primarily in the Company’s Optimization Software & Services group