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Debt Long-term debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt consisted of the following:
 
September 30,
2018
 
December 31,
2017
2014 term note
$
40,300

 
$
44,275

Mortgage loan
2,643

 
2,779

Total
42,943

 
47,054

Less amounts classified as current
22,691

 
2,482

Long-term debt, excluding current portion
$
20,252

 
$
44,572