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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | $ 2,668 | $ 2,448 |  | $ 2,440 |  | $ 3,351 |
Valuation Allowances and Reserves, Charged to Cost and Expense |  | 567 | 752 |  | 157 |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction |  | 5,098 | 4,083 |  | 4,692 |  |  |
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 1,268 | 1,316 |  | 1,290 |  | 2,540 |
Valuation Allowances and Reserves, Charged to Cost and Expense |  | 567 | 752 |  | 122 |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | [1] | 615 | 726 |  | 1,372 |  |  |
Allowance for revenue adjustments [Member] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 1,005 | 737 | [2] | 755 | [2] | 451 | [2]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account |  | 4,751 | 3,339 |  | 3,624 |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | [3] | 4,483 | 3,357 |  | 3,320 |  |  |
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 395 | 395 |  | 395 |  | $ 360 |
Valuation Allowances and Reserves, Charged to Cost and Expense |  | $ 0 | $ 0 |  | $ 35 |  |  |
[1] | Represents uncollectible accounts written off, net of recoveries.
[2] | Represents an allowance for revenue adjustments to accounts receivable resulting from future billing rate changes.
[3] | Represents adjustments to billed accounts receivable

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: 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(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 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(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: 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(Column C)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: 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(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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