Allowance for Doubtful Accounts (Reserve For Impaired Notes Receivable) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reserve for Impaired Notes Receivable
Balance Beginning of Year	$ 958	$ 1,066	$ 930
Additions	1,072	108	196
Deductions	11	216	60
Balance End of Year	$ 2,019	$ 958	$ 1,066