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Allowance for Credit Losses (Tables) | 12 Months Ended
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Dec. 31, 2021
Allowance for Credit Losses |
Schedule of allowance for credit losses |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at |  | ​ |  | ​ |  | Balance at
​ | ​ | Beginning of | ​ | Charged to | ​ | Deductions/ | ​ | End of
​ | ​ | Period (1) | ​ | Expense | ​ | Transfers (2) | ​ | Period
Allowance for credit losses | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, 2021 | ​ | $ | 5,000 |  | (5,000) |  | — | ​ | $ | —
Year ended December 31, 2020 | ​ | $ | 5,000 |  | — |  | — | ​ | $ | 5,000
Year ended December 31, 2019 | ​ | $ | — |  | — |  | — | ​ | $ | —
(1) | Amount in the year ended December 31, 2020 represents the cumulative effect of the adoption of ASU No. 2016-13 on the Secured Note receivable.
(2) | Deductions represent accounts written off, net of recoveries.

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