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Allowance for Doubtful Accounts - Allowance for doubtful accounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accounts receivable |  |  |  |
Accounts receivable, Allowance for doubtful accounts, beginning balance | $ 46,526 | $ 74,389 | $ 51,052 | $ 39,903
Write-Offs | (75) | (9,987) | (7,380) | (14,396)
Bad Debt Expense | 3,792 | 1,897 | 6,571 | 4,083
Notes receivable |  |  |  |
Notes receivable, Allowance for doubtful accounts, beginning balance | 14,576 | 17,891 | 16,749 | 12,490
Accounts receivable, Allowance for doubtful accounts, ending balance | 50,243 | 66,299 | 50,243 | 66,299
Write-Offs | 39 | (2,168) | (2,770) | (2,168)
Bad Debt Expense | (498) | 1,964 | 138 | 1,838
Notes receivable, Allowance for doubtful accounts, ending balance | 14,117 | 17,687 | 14,117 | 17,687
Total accounts and notes receivable |  |  |  |
Allowance for doubtful accounts, beginning balance | 61,102 | 92,280 | 67,801 | 52,393
Write-Offs | (36) | (12,155) | (10,150) | (16,564)
Bad Debt Expense | 3,294 | 3,861 | 6,709 | 5,921
Allowance for doubtful accounts, ending balance | 64,360 | 83,986 | 64,360 | 83,986
Accounts receivable recovered after write off | 100 | 800 | 100 | 800
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 | 12,993 | 11,654 | 13,258 | 6,667
Write-Offs | 0 | (1,721) | (9) | (1,721)
Bad Debt Expense | (459) | 1,936 | (715) | 1,687
Notes receivable, Allowance for doubtful accounts, ending balance | 12,534 | 11,869 | 12,534 | 11,869
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 | 6,237 | 3,491 | 5,823
Write-Offs | 39 | (447) | (2,761) | (447)
Bad Debt Expense | (39) | 28 | 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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