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Receivables (Activity Related To Allowance For Credit Losses) (Details) (USD $)
In Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Receivables    
Allowance for credit losses, beginning balance $ 971 $ 1,028
Change in loan loss provision   (57)
Write-offs (137)  
Allowance for credit losses, ending balance $ 834 $ 971