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Allowance for Doubtful Accounts (Impaired Notes Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Impaired Notes Receivable      
Balance Beginning of Year $ 1,639 $ 1,855 $ 1,910
Additions 1,267 0 5
Deductions 14 216 60
Balance End of Year 2,892 1,639 1,855
Average Outstanding Balance $ 2,266 $ 1,747 $ 1,883