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Other Income (Tables)
 9 Months Ended
Sep. 30, 2017
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income, by Component [Table Text Block]
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Other income (expense)
$
(7
)
 
$
26

 
$
271

 
$
(220
)
Loss on sale of business (1)
(1,424
)
 
(800
)
 
(1,424
)
 
(800
)
Gain on sale of investments (2)
168

 
682

 
168

 
682

Foreign currency transaction gain (loss)
9,912

 
(5,916
)
 
18,797

 
9,868

 
$
8,649

 
$
(6,008
)
 
$
17,812

 
$
9,530