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SJW Group and CTWS Merger (the “Merger”) Business Combination, Proforma Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Business Acquisition, Pro Forma Information [Abstract] |
Business Acquisition, Pro Forma Information [Table Text Block] | The amounts of revenue and pretax loss of CTWS included in SJW Group’s Consolidated Statements of Comprehensive Income from the acquisition date in October 2019 through December 31, 2019 are as follows:
Total revenues | $ | 21,672 |
Pretax (loss) | (3,174 | )
The following unaudited pro forma financial information summarizes the combined results of operations for SJW Group and CTWS, as though the companies were combined as of January 1, 2018.
| Fiscal Year Ended December 31,
| 2019 |  | 2018
Total revenues | $ | 515,153 |  |  | 514,364 |
Pretax income (loss) | 60,862 |  |  | 72,938 |
Net income (loss) | 56,968 |  |  | 65,449 |
Basic earnings per share | 2.00 |  |  | 2.31 |

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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