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Schedule II - Valuation and Qualifying Accounts (Notes) | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] |
Col. A |  | Col. B |  | Col. C |  | Col. D |  | Col. E
|  | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Operating Revenue |  | Deductions -Described |  | Balance at End of Period
Year ended December 31, 2020 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,316 |  |  | $ | 567 |  |  | $ | — |  |  | $ | 615 |  | 2 | $ | 1,268 |
Allowance for revenue adjustments 1 |  | 737 |  |  | — |  |  | 4,751 |  |  | 4,483 |  | 3 | 1,005 |
Deferred tax valuation allowance |  | 395 |  |  | — |  |  | — |  |  | — |  |  | 395 |
|  | 2,448 |  |  | 567 |  |  | 4,751 |  |  | 5,098 |  |  | 2,668 |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,290 |  |  | $ | 752 |  |  | $ | — |  |  | $ | 726 |  | 2 | $ | 1,316 |
Allowance for revenue adjustments 1 |  | 755 |  |  | — |  |  | 3,339 |  |  | 3,357 |  | 3 | 737 |
Deferred tax valuation allowance |  | 395 |  |  | — |  |  | — |  |  | — |  |  | 395 |
|  | 2,440 |  |  | 752 |  |  | 3,339 |  |  | 4,083 |  |  | 2,448 |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 2,540 |  |  | $ | 122 |  |  | $ | — |  |  | $ | 1,372 |  | 2 | $ | 1,290 |
Allowance for revenue adjustments 1 |  | 451 |  |  | — |  |  | 3,624 |  |  | 3,320 |  | 3 | 755 |
Deferred tax valuation allowance |  | 360 |  |  | 35 |  |  | — |  |  | — |  |  | 395 |
|  | 3,351 |  |  | 157 |  |  | 3,624 |  |  | 4,692 |  |  | 2,440 |
1 Represents an allowance for revenue adjustments to accounts receivable resulting from future billing rate changes. 2 Represents uncollectible accounts written off, net of recoveries. 3 Represents adjustments to billed 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=120395691&loc=d3e24092-122690 + Details
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Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
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