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Contingent Liabilities (Schedule of Product Liability Expense) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Product Liability Contingency [Line Items] |  |  |  |  |  |
Product liability expense | $ 177 |  | $ 1,617 |  | $ 9 |
Accrued Legal Expense [Member] |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |
Product liability expense | (633) | [1] | 755 | [1] | (834) | [1]
Insurance Premium Expense [Member] |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |
Product liability expense | $ 810 | [2] | $ 862 | [2] | $ 843 | [2]
[1] | The expense accrued in the liability is for legal fees only. In 2010 and 2012, the costs incurred related to cases that were settled or dismissed were less than the amounts accrued for these cases in prior years.
[2] | Insurance expense represents the cost of insurance premiums.

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- Definition The amount of loss reported during the period pertaining to product liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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