Inventories (Tables)

6 Months Ended

Jun. 30, 2016

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following (in thousands):

	June 30, 2016		December 31, 2015
Raw material	$	27,265	$	24,681
Work in process	4,258		4,282
Finished goods	18,396		14,669
Total inventories	$	49,919	$	43,632