Inventories (Tables)

3 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following (in thousands):

	March 31, 2016		December 31, 2015
Raw material	$	26,703	$	24,681
Work in process	4,800		4,282
Finished goods	17,737		14,669
Total inventories	$	49,240	$	43,632