Other Current Liabilities (Details1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of changes in liability for product warranty claims
Balance at beginning of the period	$ 5,498	$ 5,113	$ 4,929
Satisfaction of warranty claims	(2,411)	(2,691)	(1,727)
Provision for warranty claims	3,399	3,087	1,987
Other, primarily impact from changes in foreign currency exchange rates	139	(11)	(76)
Balance at end of the period	$ 6,625	$ 5,498	$ 5,113