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Schedule II Valuation and Qualifying | 12 Months Ended
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Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II Valuation and Qualifying Accounts | Schedule II. Valuation and Qualifying Accounts for the Years Ended December 31, 2022, 2021 and 2020 (in thousands):
|  | Balance at Beginning of Year |  |  | Charged (Credited) to Expenses |  |  | Charged (Credited) to Other Accounts |  |  | Balance at End of Year |
Deferred income tax asset: |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  |  |  |  |  |  |  |
2020 |  | $ | 37,243 |  |  | $ | (63,346 | ) |  | $ | 257,397 |  |  | $ | 231,294 |
2021 |  | $ | 231,294 |  |  | $ | (52,563 | ) |  | $ | — |  |  | $ | 178,731 |
2022 |  | $ | 178,731 |  |  | $ | (58,223 | ) |  | $ | — |  |  | $ | 120,508 |
Accounts receivable and unbilled contract receivables |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  |  |  |  |  |  |  |  |  |  |  |
2020 |  | $ | 2,056 |  |  | $ | 975 |  |  | $ | — |  |  | $ | 3,031 |
2021 |  | $ | 3,031 |  |  | $ | (1,923 | ) |  | $ | — |  |  | $ | 1,108 |
2022 |  | $ | 1,108 |  |  | $ | (395 | ) |  | $ | — |  |  | $ | 713 |

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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 https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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