Inventories (Tables)

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

	September 30, 2017		December 31, 2016
Finished goods	$	21,777	$	21,635
Parts and materials	11,143		11,185
Work in progress	1,579		900
Total inventories	$	34,499	$	33,720