Finance Lease Receivables - Components of Finance Lease Receivables (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for credit losses	$ (4,573)	$ (2,572)	$ (2,257)
Finance Leases Financing Receivable [Member]
Gross minimum lease receivable	109,312	76,763
Allowance for credit losses	(439)	(525)	(210)
Estimated unguaranteed residual values	6,979	7,508
Total Minimum Payments to be Received And Unguaranteed Residual Values	115,852	83,746
Unearned interest income	(9,345)	(4,771)
Unearned residuals	(1,016)	(1,319)
Unearned Interest Income and Residuals	(10,361)	(6,090)
Total	$ 105,491	$ 77,656