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Schedule II - Valuation and Qualifying Accounts and Reserves | 12 Months Ended
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Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts and Reserves | SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES OTTER TAIL CORPORATION Below is a summary of activity within valuation and qualifying accounts for the years ended December 31, 2021, 2020 and 2019:
(in thousands) | Balance, January 1 |  | Charged to Cost and Expenses |  | Deductions 1, 2 |  | Balance, December 31
Allowance for Credit Losses |  |  |  |  |  |  |
2021 | $ | 3,215 |  |  | $ | 93 |  |  | $ | (1,472) |  |  | $ | 1,836 |
2020 | 1,339 |  |  | 3,138 |  |  | (1,262) |  |  | 3,215 |
2019 | 1,407 |  |  | 986 |  |  | (1,054) |  |  | 1,339 |
Deferred Tax Asset Valuation Allowance |  |  |  |  |  |  |
2021 | $ | 800 |  |  | $ | — |  |  | $ | (800) |  |  | — |
2020 | 800 |  |  | — |  |  | — |  |  | 800 |
2019 | 600 |  |  | 200 |  |  | — |  |  | 800 |
1 Amounts under Allowance for Credit Losses reflect deductions to the allowance for amounts written-off, net of recoveries. |  |  |  |
2 Amounts under Deferred Tax Asset Valuation Allowance reflect a release of a valuation allowance based on current expectations of the realizability of the associated deferred tax asset.

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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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