Restructuring (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Components of restructuring expenses and reserve
Accrued restructuring, beginning of period	$ 1,383,000	$ 2,366,000
Employee severance, benefits and related costs	39,000	85,000
Payments	(814,000)	(609,000)
Inventory and other adjustments		(79,000)
Accrued restructuring, end of period	$ 608,000	$ 1,763,000