Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Net Investment in Sales-type Leases (Narrative) (Details)

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Net Investment in Sales-type Leases (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Investment in Sales-type Leases [Abstract]      
Interest income for sales-type leases $ 0.8us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldForSale $ 0.5us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldForSale $ 0.4us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldForSale