| Net Investment in Sales-type Leases (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended | ||
|---|---|---|---|
| Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | |
| Leases, Capital [Abstract] | |||
| Interest income for sales-type leases | $ 1.0 | $ 1.0 | $ 0.8 | 
| X | ||||||||||
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- Definition The amount of interest and fee income earned from loans held-for-sale, including mortgage loans, and interest earned from direct financing and sales-type leases held-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- References No definition available. 
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