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Allowance for Doubtful Accounts - Schedule of Changes in Allowance for Notes Receivable (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accounts receivable |  |  |  |
Accounts receivable, Allowance for doubtful accounts, beginning balance | $ 50,243 | $ 66,299 | $ 51,052 | $ 39,903
Write-Offs | (427) | (2,475) | (7,807) | (16,871)
Bad Debt Expense | 4,230 | 967 | 10,801 | 5,050
Accounts receivable, Allowance for doubtful accounts, ending balance | 54,046 | 64,791 | 54,046 | 64,791
Notes receivable |  |  |  |
Notes receivable, Allowance for doubtful accounts, beginning balance | 14,117 | 17,687 | 16,749 | 12,490
Write-Offs | 0 | (253) | (2,770) | (2,421)
Bad Debt Expense | (149) | (132) | (11) | 1,706
Notes receivable, Allowance for doubtful accounts, ending balance | 13,968 | 17,302 | 13,968 | 17,302
Total accounts and notes receivable |  |  |  |
Allowance for doubtful accounts, beginning balance | 64,360 | 83,986 | 67,801 | 52,393
Write-Offs | (427) | (2,728) | (10,577) | (19,292)
Bad Debt Expense | 4,081 | 835 | 10,790 | 6,756
Allowance for doubtful accounts, ending balance | 68,014 | 82,093 | 68,014 | 82,093
Accounts receivable recovered after write off |  | 100 | 100 | 900
Cumulative effect of ASC 326 adoption |  |  |  |
Accounts receivable |  |  |  |
Accounts receivable, Allowance for doubtful accounts, beginning balance |  |  |  | 36,709
Notes receivable |  |  |  |
Notes receivable, Allowance for doubtful accounts, beginning balance |  |  |  | 5,527
Total accounts and notes receivable |  |  |  |
Allowance for doubtful accounts, beginning balance |  |  |  | 42,236
Standard notes receivable |  |  |  |
Notes receivable |  |  |  |
Notes receivable, Allowance for doubtful accounts, beginning balance | 12,534 | 11,869 | 13,258 | 6,667
Write-Offs | 0 | (253) | (9) | (1,974)
Bad Debt Expense | (149) | (132) | (864) | 1,555
Notes receivable, Allowance for doubtful accounts, ending balance | 12,385 | 11,484 | 12,385 | 11,484
Standard notes receivable | Cumulative effect of ASC 326 adoption |  |  |  |
Notes receivable |  |  |  |
Notes receivable, Allowance for doubtful accounts, beginning balance |  |  |  | 5,236
Elevated risk notes receivable |  |  |  |
Notes receivable |  |  |  |
Notes receivable, Allowance for doubtful accounts, beginning balance | 1,583 | 5,818 | 3,491 | 5,823
Write-Offs | 0 | 0 | (2,761) | (447)
Bad Debt Expense | 0 | 0 | 853 | 151
Notes receivable, Allowance for doubtful accounts, ending balance | $ 1,583 | $ 5,818 | $ 1,583 | 5,818
Elevated risk notes receivable | Cumulative effect of ASC 326 adoption |  |  |  |
Notes receivable |  |  |  |
Notes receivable, Allowance for doubtful accounts, beginning balance |  |  |  | $ 291

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- Definition Amount of allowance for credit loss of accounts and financing receivables. Includes, but is not limited to, notes and loan receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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