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Leases - Sales-type Lease Future Undiscounted Cash Flows (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Leases [Abstract]  
2021 $ 5,152
2022 3,417
2023 2,796
2024 1,935
2025 590
Total undiscounted cash flows 13,890
Present value of lease payments 12,127
Difference between undiscounted cash flows and discounted cash flows  $ 1,763