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Lessor Leases - Income Recognized from Sales-Type Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Sales-type lease revenues $ 26,040 $ 37,175  
Sales-type lease revenues     $ 39,167
Cost of sales-type lease revenues (10,624) (14,985)  
Cost of sales-type lease revenues     (16,185)
Selling profit on sales-type lease revenues 15,416 22,190  
Selling profit on sales-type lease revenues     22,982
Interest income on sales-type lease receivables $ 1,933 $ 1,756  
Interest income on sales-type lease receivables     $ 1,296