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Accumulated Other Comprehensive (Loss) / Income (Tables)
 9 Months Ended
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of changes in accumulated other comprehensive income (loss)
The changes in accumulated other comprehensive (loss) income during the nine months ended September 30, 2019 were as follows:
 
Balance at December 31, 2018
 
Other comprehensive loss
 
Tax effect
 
Balance at September 30, 2019
Foreign currency
$
(26,436
)
 
$
(1,928
)
 
$
—

 
$
(28,364
)
Unrealized loss on intra-entity foreign currency transactions
(3,906
)
 
(1,207
)
 
348

 
(4,765
)
Unrealized holding losses on marketable debt securities
(41
)
 
(710
)
 
—

 
(751
)
Total
$
(30,383
)
 
$
(3,845
)
 
$
348

 
$
(33,880
)