Allowance for Credit Losses (Activity in Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 150	$ 133
Provision (reversal of provision)	(4)	17
Ending balance	146	150
Finance Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance
Provision (reversal of provision)
Ending balance
Accounts Receivable Allowance for Doubtful Accounts [Member] | Operating Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	150	133
Provision (reversal of provision)	(4)	17
Ending balance	$ 146	$ 150