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Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table shows the components of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2018 and 2017, respectively, net of tax effects: 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Accumulated Other Comprehensive Income (Loss):
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Foreign currency translation adjustment:
 
 

 
 

 
 
 
 
Beginning balance
 
$
(23,435
)
 
$
(23,089
)
 
$
(23,202
)
 
$
(23,336
)
Net other comprehensive income (loss)
 
(60
)
 
(229
)
 
(293
)
 
18

Balance at September 30,
 
$
(23,495
)
 
$
(23,318
)
 
$
(23,495
)
 
$
(23,318
)
 
 
 
 
 
 
 
 
 
Unrealized gain (loss) on marketable securities, net
 
 

 
 

 
 
 
 
Beginning balance
 
$
(224
)
 
$
409

 
$
(64
)
 
$
(229
)
Net other comprehensive income (loss), net of ($18), $92, ($88) and $0 tax, respectively
 
68

 
(512
)
 
(92
)
 
126

Balance at September 30,
 
$
(156
)
 
$
(103
)
 
$
(156
)
 
$
(103
)
Accumulated other comprehensive loss at September 30,
 
$
(23,651
)
 
$
(23,421
)
 
$
(23,651
)
 
$
(23,421
)