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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
Foreign currency translation adjustment
(Amount in thousands)
 
Unrealized gain (loss) on available-for-sale securities
(Amount in thousands)
 
Accumulated Other Comprehensive Loss
(Amount in thousands)
Beginning balance at December 31, 2014
$
(424
)
 
$
(7
)
 
$
(431
)
Change during the year
(1,158
)
 
(5
)
 
(1,163
)
Ending balance at December 31, 2015
$
(1,582
)
 
$
(12
)
 
$
(1,594
)
Change during the year
(853
)
 
10

 
(843
)
Ending balance at December 31, 2016
$
(2,435
)
 
$
(2
)
 
$
(2,437
)