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Schedule II—Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II—Valuation and Qualifying Accounts | Schedule II—Valuation and Qualifying Accounts The tables below detail the activity of the customer receivable reserve, insurance liability, and the valuation allowance on deferred tax assets for the years ended December 31, 2019, 2020, and 2021 (in thousands):
| Balance at Beginning of Period | Charged to Expenses | Charges Utilized/ Write-Offs | Balance at End of Period
Customer Receivable Reserve |  |  |  |
Year Ended December 31, 2019 | $ | 25,966 |  | $ | 77,053 |  | $ | (51,708) |  | $ | 51,311 |
Year Ended December 31, 2020 | $ | 51,311 |  | $ | 107,685 |  | $ | (68,449) |  | $ | 90,547 |
Year Ended December 31, 2021 | $ | 90,547 |  | $ | 27,285 |  | $ | (86,962) |  | $ | 30,870 |
| Balance at Beginning of Period | Additions for Current Period | Changes in Estimates for Prior Periods | Net Payments | Balance at End of Period
Insurance Liability |  |  |  |  |
Year Ended December 31, 2019 | $ | 43,912 |  | $ | 130,559 |  | $ | (7,140) |  | $ | (94,558) |  | $ | 72,773 |
Year Ended December 31, 2020 | $ | 72,773 |  | $ | 98,735 |  | $ | (21,484) |  | $ | (99,004) |  | $ | 51,020 |
Year Ended December 31, 2021 | $ | 51,020 |  | $ | 85,313 |  | $ | 1,308 |  | $ | (90,408) |  | $ | 47,233 |
| Balance at Beginning of Period | Charged (Credited) to Expenses | Charged to Other Accounts | Balance at End of Period
Valuation Allowance on Deferred Tax Assets |  |  |  |
Year Ended December 31, 2019 | $ | 190,583 |  | $ | 824,628 |  | $ | 8,794 |  | $ | 1,024,005 |
Year Ended December 31, 2020 | $ | 1,024,005 |  | $ | 1,029,064 |  | $ | — |  | $ | 2,053,069 |
Year Ended December 31, 2021 | $ | 2,053,069 |  | $ | 1,210,754 |  | $ | — |  | $ | 3,263,823 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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