Inventories (Tables)

12 Months Ended

Dec. 31, 2011

Inventory Disclosure [Abstract]

Schedule of inventory

Inventories consist of the following at December 31,:

	2010		2011
Raw materials	$	49,038	$	52,351
Work in process	15,460		15,499
Finished goods	108,298		100,588
	$	172,796	$	168,438