Net Investment in Sales-Type Leases - Long Term Net Investment in Sales Type Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Capital Leased Assets [Line Items]
Net minimum lease payments to be received	$ 20,731	$ 17,616
Less: unearned interest income portion	(1,000)	(1,131)
Net investment in sales-type leases	19,731	16,485
Less: short-term portion	(6,174)	(5,637)
Long-term net investment in sales-type leases	13,557	10,848
Collective allowance for credit losses	$ 100	$ 200
Minimum [Member]
Capital Leased Assets [Line Items]
Terms of sales-type leases (generally up to five years in length)	1 year
Maximum [Member]
Capital Leased Assets [Line Items]
Terms of sales-type leases (generally up to five years in length)	5 years