Inventory (Tables)

6 Months Ended

Jun. 30, 2011

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

The major classes of inventory were as follows:

Inventory	June 30, 2011		December 31, 2010
	(in thousands)
Raw materials	$	12,860	$	9,801
Work-in-progress	9,572		7,183
Finished goods	6,729		8,359
Total	$	29,161	$	25,343