Inventories: (Tables)

3 Months Ended

Mar. 31, 2012

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following:

	March 31, 2012		December 31, 2011
Raw material	$	21,924	$	25,227
Work in process	3,861		2,901
Finished goods	11,505		12,295
Total	$	37,290	$	40,423