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Net Investment in Sales-Type Leases - Long Term Net Investment in Sales Type Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]    
Net minimum lease payments to be received $ 25,899 $ 33,591
Less: unearned interest income portion (1,695) (2,763)
Net investment in sales-type leases 24,204 30,828
Less: short-term portion (8,769) (10,243)
Long-term investment in sales-type leases, net $ 15,435 $ 20,585