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Credit Losses on Financial Assets and Other Instruments
 12 Months Ended
Dec. 31, 2023
Credit Loss [Abstract]  
Credit Losses on Financial Assets and Other Instruments Credit Losses on Financial Assets and Other Instruments
The table below sets forth the activity for our allowance for credit losses in 2021, 2022 and 2023 (in thousands):
Investing ReceivablesTenant Notes
Receivable (1)		Other Assets (2)Total
December 31, 2020$2,851 $1,203 $643 $4,697 
Credit loss (recoveries) expense (3)(1,252)(146)270 (1,128)
December 31, 20211,599 1,057 913 3,569 
Credit loss expense (recoveries) (3)1,195 (279)(645)271 
December 31, 20222,794 778 268 3,840 
Credit loss recoveries (3)(417)(79)(115)(611)
Write-offs— (33)— (33)
December 31, 2023$2,377 $666 $153 $3,196 
(1)Included in the line entitled “accounts receivable, net” on our consolidated balance sheets.
(2)The balance as of December 31, 2023 and December 31, 2022 included $87,000 and $52,000, respectively, in the line entitled “accounts receivable, net” and $66,000 and $216,000, respectively, in the line entitled “prepaid expenses and other assets, net” on our consolidated balance sheets.
(3)Included in the line entitled “interest and other income, net” on our consolidated statements of operations.
The following table presents the amortized cost basis of our investing receivables, tenant notes receivable and sales-type lease receivables by credit risk classification, by origination year as of December 31, 2023 (in thousands):
Origination Year
2018 and Earlier20192020202120222023Total
Investing receivables:
Credit risk classification:
Investment grade$66,105 $— $2,326 $8,336 $— $255 $77,022 
Non-investment grade— — — — 6,867 — 6,867 
Total $66,105 $— $2,326 $8,336 $6,867 $255 $83,889 
Tenant notes receivable:
Credit risk classification:
Investment grade$686 $15 $115 $— $— $— $816 
Non-investment grade125 46 1,433 — — — 1,604 
Total$811 $61 $1,548 $— $— $— $2,420 
Gross write-offs during the year ended December 31, 2023
$33 $— $— $— $— $— $33 
Sales-type lease receivable:
Credit risk classification:
Investment grade$— $— $5,098 $— $— $— $5,098 

Our investment grade credit risk classification represents entities with investment grade credit ratings from ratings agencies (such as S&P Global Ratings, Moody’s Investors Service, Inc. or Fitch Ratings, Inc.), meaning that they are considered to have at least an adequate capacity to meet their financial commitments, with credit risk ranging from minimal to moderate. Our non-investment grade credit risk classification represents entities with either no credit agency credit ratings or ratings deemed to be sub-investment grade; we believe that there is significantly more credit risk associated with this classification. The credit risk classifications of our investing receivables and tenant notes receivable were last updated in December 2023.

An insignificant portion of the investing and tenant notes receivables set forth above was past due, which we define as being delinquent by more than three months from the due date.

Notes receivable on nonaccrual status as of December 31, 2023 and 2022 were not significant. We did not recognize any interest income on notes receivable on nonaccrual status during the years ended December 31, 2023, 2022 and 2021.