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Debt Long-term debt (Tables)
3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt consisted of the following:
 
March 31,
2018
 
December 31,
2017
Term note
$
41,450

 
$
44,275

Mortgage loan
2,735

 
2,779

Total
44,185

 
47,054

Less amounts classified as current
2,484

 
2,482

Long-term debt, excluding current portion
$
41,701

 
$
44,572