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 Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases, Capital [Abstract]      
Interest income for sales-type leases $ 700 $ 1,000 $ 1,000