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Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts: |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, beginning of period | $ 1,512 | $ 272 | $ 190
Opening balance, SJWNE, LLC | 0 | 1,283 | 0
Charged to expense | (177) | 520 | 430
Charged to regulatory asset | 3,032 | 0 | 0
Accounts written off | (800) | (875) | (650)
Recoveries of accounts written off | 324 | 312 | 302
Balance, end of period | 3,891 | 1,512 | 272
Reserve for litigation and claims: |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, beginning of period | 2,898 | 2,181 | 1,892
Charged to expense | 958 | 3,221 | 480
Accounts written off | (122) | (135) | 1
Payments | (3,050) | (2,369) | (192)
Balance, end of period | $ 684 | $ 2,898 | $ 2,181

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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