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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of changes in accumulated balances of other comprehensive loss
The following table summarizes the changes in accumulated other comprehensive loss (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018

2019
 
2018
Beginning balance
$
(4,303
)
 
$
(3,780
)
 
$
(4,214
)
 
$
(3,597
)
Other comprehensive income (loss) due to foreign currency translation, net of tax
74

 
(335
)
 
(15
)
 
(518
)
Ending balance
$
(4,229
)
 
$
(4,115
)

$
(4,229
)
 
$
(4,115
)