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Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |
Balance at beginning of period | [1] | $ 438 | $ 533 |
Recovered from/charged to costs and expenses |  | 330 | 83 |
Deductions | [2],[3] | 205 | 178 |
Balance at end of period |  | 563 | 438 | [1]
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |
Balance at beginning of period | [1] | 2,511 | 2,450 |
Recovered from/charged to costs and expenses |  | 44 | 61 |
Deductions | [2],[3] | 2,158 |  |
Balance at end of period |  | $ 397 | $ 2,511 | [1]
[1] | Beginning balance updated to reflect Immaterial Revision to the consolidated financial statements as described further in Note 2. The valuation allowance for deferred tax asset line item disclosure has been included within this table with the balance at the end of the period updated to reflect the revision in the valuation allowance consistent with the description in Note 5.
[2] | Uncollectible accounts written off, net of recoveries
[3] | Valuation allowance amounts released

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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 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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