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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Loss
The following table summarizes the changes in accumulated balances of other comprehensive loss, net of tax:
 
Foreign currency
 
Change in unrealized gains on available-for-sale securities
 
Total
 
(in thousands)
Balances as of December 31, 2016
$
(47,966
)
 
$
(599
)
 
$
(48,565
)
Other comprehensive income before reclassifications
27,409

 
728

 
28,137

Amounts reclassified from accumulated other comprehensive (loss) income
—

 
(129
)
 
(129
)
Net decrease in other comprehensive loss
27,409

 
599

 
28,008

Balances as of December 31, 2017
$
(20,557
)
 
$
—

 
$
(20,557
)
Other comprehensive income before reclassifications
975

 
—

 
975

Net decrease in other comprehensive loss
975

 
—

 
975

Balances as of December 31, 2018
$
(19,582
)
 
$
—

 
$
(19,582
)