Allowance for Credit Losses (Activity in Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 150	$ 133
(Reversal of provision) provision	1	17
Charge-offs and/or recoveries	(143)
Ending balance	8	150
Finance Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance
(Reversal of provision) provision
Charge-offs and/or recoveries
Ending balance
Accounts Receivable Allowance for Doubtful Accounts [Member] | Operating Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	150	133
(Reversal of provision) provision	1	17
Charge-offs and/or recoveries	(143)
Ending balance	$ 8	$ 150