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Valuation Accounts (Schedule Of Valuation Accounts) (Details) (Allowance For Doubtful Accounts [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Allowance For Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 586 [1] $ 417 [1] $ 1,072 [1]
Additions, Charges to Operations 546 [1] 385 [1] (51) [1]
Additions, Other (23) [1] (29) [1] (6) [1]
Deductions 15 [1] 187 [1] 598 [1]
Balance at End of Period $ 1,094 [1] $ 586 [1] $ 417 [1]
[1] Deductions in the allowance for doubtful accounts represent write-offs, net of recoveries, of amounts determined to be uncollectible.