Allowance For Credit Losses (Activity in Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	$ 22	$ 8
(Reversal of) provision for doubtful accounts	(12)	14
Ending Balance	10	22
Accounts Receivable Allowance for Doubtful Accounts [Member] | Operating Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	22	8
(Reversal of) provision for doubtful accounts	(12)	14
Ending Balance	$ 10	$ 22