Inventories (Tables)

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following (in thousands):

	September 30, 2016		December 31, 2015
Raw material	$	28,940	$	24,681
Work in process	4,834		4,282
Finished goods	17,179		14,669
Total inventories	$	50,953	$	43,632