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Allowance for Doubtful Accounts - Allowance for doubtful accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts receivable |  |  |
Accounts receivable, Allowance for doubtful accounts, beginning balance | $ 39,903 |  |
Write-Offs | (31,139) |  |
Bad Debt Expense | 5,579 |  |
Accounts receivable, Allowance for doubtful accounts, ending balance | 51,052 | $ 39,903 |
Notes receivable |  |  |
Balance End of Year | 16,749 | 12,490 | $ 13,472
Write-Offs | (5,325) |  |
Bad Debt Expense | 4,057 |  |
Balance Beginning of Year | 12,490 | 13,472 | 2,884
Allowance for doubtful accounts, beginning balance | 52,393 |  |
Write-Offs | (36,464) |  |
Bad Debt Expense | 9,636 | 25,480 | $ 51,387
Allowance for doubtful accounts, ending balance | 67,801 | 52,393 |
Accounts receivable recovered after write off | 1,000 |  |
Cumulative Impact from Adopting ASC 326 Guidance |  |  |
Accounts receivable |  |  |
Accounts receivable, Allowance for doubtful accounts, beginning balance | 36,709 |  |
Accounts receivable, Allowance for doubtful accounts, ending balance |  | 36,709 |
Notes receivable |  |  |
Balance End of Year |  | 5,527 |
Balance Beginning of Year | 5,527 |  |
Allowance for doubtful accounts, beginning balance | 42,236 |  |
Allowance for doubtful accounts, ending balance |  | 42,236 |
Standard notes receivable |  |  |
Notes receivable |  |  |
Balance End of Year | 13,258 | 6,667 |
Write-Offs | (2,238) |  |
Bad Debt Expense | 3,593 |  |
Balance Beginning of Year | 6,667 |  |
Standard notes receivable | Cumulative Impact from Adopting ASC 326 Guidance |  |  |
Notes receivable |  |  |
Balance End of Year |  | 5,236 |
Balance Beginning of Year | 5,236 |  |
Elevated risk notes receivable |  |  |
Notes receivable |  |  |
Balance End of Year | 3,491 | 5,823 |
Write-Offs | (3,087) |  |
Bad Debt Expense | 464 |  |
Balance Beginning of Year | 5,823 |  |
Elevated risk notes receivable | Cumulative Impact from Adopting ASC 326 Guidance |  |  |
Notes receivable |  |  |
Balance End of Year |  | $ 291 |
Balance Beginning of Year | $ 291 |  |

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- Definition Accounts and Financing Receivable, Credit Loss Expense (Reversal) + References No definition available. + Details
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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=121611835&loc=d3e5074-111524 + Details
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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: 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=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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