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Allowance For Doubtful Accounts (Impaired Notes Receivable) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Allowance For Doubtful Accounts [Abstract]      
Impaired Notes Receivable, Balance Beginning of Year $ 1,910,000 $ 2,900,000 $ 3,000,000
Impaired Notes Receivable, Additions 5,000 676,000 100,000
Impaired Notes Receivable, Deductions 60,000 1,666,000 200,000
Impaired Notes Receivable, Balance End of Year 1,855,000 1,910,000 2,900,000
Impaired Notes Receivable, Average Outstanding Balance $ 1,883,000 $ 2,405,000 $ 2,950,000