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Other Financial Statement Information (Allowance For Doubtful Receivables) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Other Financial Statement Information [Abstract]    
Balance at beginning of period $ 49 $ 50
Provision for doubtful receivables 9  
Write-offs (16) (1)
Balance at end of period $ 42 $ 49