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Allowance For Doubtful Accounts (Reserve For Impaired Notes Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Reserve for Impaired Notes Receivable, Balance Beginning of Year $ 1,066 $ 930 $ 2,100
Reserve for Impaired Notes Receivable, Additions 108 196 496
Reserve for Impaired Notes Receivable, Deductions 216 60 1,666
Reserve for Impaired Notes Receivable, Balance End of Year $ 958 $ 1,066 $ 930