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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2017
Accumulated Other Comprehensive Loss [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The components of accumulated other comprehensive loss, net of tax, are as follows:
 
 
Foreign currency translation adjustments
 
Net unrealized (gains) losses on available-for-sale investments
 
Accumulated other comprehensive loss (income)
Beginning Balance, December 31, 2016
 
$
2,742

 
$
37

 
$
2,779

    Net current period other comprehensive income
 
(1,253
)
 
(45
)
 
(1,298
)
    Reclassifications
 
—

 
—

 
—

Ending balance, June 30, 2017
 
$
1,489

 
$
(8
)
 
$
1,481