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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
Foreign currency translation adjustment
 
Unrealized gain (loss) on available-for-sale securities
 
Accumulated Other Comprehensive Income (Loss)
Beginning balance at December 31, 2016
$
(2,435
)
 
$
(2
)
 
$
(2,437
)
Change during January - September 2017
513

 
3

 
516

Balance at September 30, 2017
$
(1,922
)
 
$
1

 
$
(1,921
)