Inventories (Tables)

3 Months Ended

Mar. 31, 2014

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consist of the following (in thousands):

	March 31, 2014		December 31, 2013
Raw materials	$	38,657	$	36,139
Work in process		21,334		19,650
Finished goods		29,206		25,489
Total inventory	$	89,197	$	81,278