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Supplementary Balance Sheet Detail (Schedule Of Inventory Reserves) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at beginning of year $ 4,233 $ 4,709   $ 2,716
Additions 19,878 4,052 4,154  
Deductions (6,499) (4,528) (2,161)  
Balance at end of year $ 17,612 $ 4,233 $ 4,709 $ 2,716