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Leases - Sales-Type Leases, Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Leases [Abstract]    
Sales-type lease, selling price $ 7,529 $ 21,113
Cost of underlying assets (2,990) (8,583)
Operating profit 4,539 12,530
Interest income $ 1,425 $ 3,011