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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables)
 3 Months Ended
Mar. 31, 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 - March 2017
83

 
(1
)
 
82

Balance at March 31, 2017
$
(2,352
)
 
$
(3
)
 
$
(2,355
)