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Lessor Leases - Income Recognized from Sales-Type Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]      
Sales-type lease revenues $ 37,175    
Sales-type lease revenues   $ 39,167 $ 29,675
Cost of sales-type lease revenues (14,985)    
Cost of sales-type lease revenues   (16,185) (12,395)
Selling profit on sales-type lease revenues 22,190    
Selling profit on sales-type lease revenues   22,982 17,280
Interest income on sales-type lease receivables $ 1,756    
Interest income on sales-type lease receivables   $ 1,296 $ 992