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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | Schedule II — Valuation and Qualifying Accounts (in thousands)
|  | Balance at Beginning of Period |  | Additions |  |  |  | Balance at End of Period
|  |  | Charged to Expense |  | Charged to Other Accounts* |  |  |
Description |  |  |  |  | Deductions** |
Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |
Reserves and allowances deducted from asset accounts: |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts and unbilled services |  | $ | 180,687 |  |  | $ | 17,872 |  |  | $ | 25,300 |  |  | $ | 21,465 |  |  | $ | 202,394 |
Valuation allowance for deferred tax asset |  | $ | 21,621 |  |  | $ | 308 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,929 |
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |  |
Reserves and allowances deducted from asset accounts: |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts and unbilled services |  | $ | 178,819 |  |  | $ | 15,386 |  |  | $ | 9,656 |  |  | $ | 23,174 |  |  | $ | 180,687 |
Valuation allowance for deferred tax asset |  | $ | 18,900 |  |  | $ | 2,721 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,621 |
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |
Reserves and allowances deducted from asset accounts: |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts and unbilled services |  | $ | 185,754 |  |  | $ | 8,912 |  |  | $ | 9,501 |  |  | $ | 25,348 |  |  | $ | 178,819 |
Valuation allowance for deferred tax asset |  | $ | 13,167 |  |  | $ | 5,733 |  |  | $ | — |  |  | $ | — |  |  | $ | 18,900 |
* Includes estimated provision for unbilled services recorded as a reduction to revenues (i.e., fee, rate and other adjustments). ** Includes estimated direct write-offs of uncollectible and unrealizable accounts receivable.

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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=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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