Contingent Liabilities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
Number of lawsuits against the company	2
Minimum limit of per claim for providing insurance coverage on annual basis	$ 5,000
Maximum limit of aggregate loss incurred annually for providing insurance coverage on annual basis	10,000
Total amount of damages claimed	0	5,400
Product liability expense	$ 177	$ 1,617	$ 9