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Financial Statement Schedule - Condensed Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 9,269 | $ 17,944 | $ 420,722 | $ 7,799
Other current assets | 5,125 | 2,928 |  |
Total current assets | 127,331 | 122,046 |  |
Other assets: |  |  |  |
Other | 6,883 | 4,676 |  |
Total other assets | 805,876 | 759,836 |  |
Total assets | 3,311,465 | 3,132,470 |  | 1,956,389
Stockholders’ equity: |  |  |  |
Common stock, $0.001 par value; authorized 70,000,000 shares in 2020 and 2019; issued and outstanding 28,556,605 shares in 2020 and 28,456,508 shares in 2019 | 29 | 28 |  |
Additional paid-in capital | 510,158 | 506,639 |  |
Retained earnings | 408,037 | 383,191 |  |
Accumulated other comprehensive (loss) income | (1,064) | 126 |  |
Total stockholders’ equity | 917,160 | 889,984 | 889,312 | 463,209
Long-term debt, less current portion | 1,287,580 | 1,283,597 |  |
Capitalization, long-term debt and equity | 2,204,740 | 2,173,581 |  |
Current liabilities: |  |  |  |
Current portion of long-term debt | 76,241 | 22,272 |  |
Accounts payable | 34,200 | 34,886 |  |
Accrued interest | 12,861 | 13,140 |  |
Other current liabilities | 19,203 | 18,279 |  |
Total current liabilities | 350,795 | 234,567 |  |
Deferred income taxes | 191,415 | 195,598 |  |
Other noncurrent liabilities | 21,786 | 22,306 |  |
Commitments and contingencies | 0 | 0 |  |
Total equity and liabilities | $ 3,311,465 | $ 3,132,470 |  |
Common stock, par value (usd per share) | $ 0.001 | $ 0.001 |  |
Common stock, shares authorized (in shares) | 70,000,000 | 70,000,000 |  |
Common stock, shares issued (in shares) | 28,556,605 | 28,456,508 |  |
Common stock, shares outstanding (in shares) | 28,556,605 | 28,456,508 |  |
SJW Group |  |  |  |
Assets |  |  |  |
Investments in subsidiaries | $ 1,536,106 | $ 1,466,110 |  |
Current assets: |  |  |  |
Cash and cash equivalents | 436 | 1,035 | $ 412,238 | $ 308
Intercompany receivables | 258 | 0 |  |
Income tax receivable | 0 | 7,491 |  |
Intercompany notes receivable | 15,680 | 6,727 |  |
Other current assets | 124 | 0 |  |
Total current assets | 16,498 | 15,253 |  |
Other assets: |  |  |  |
Other | 0 | 13 |  |
Total other assets | 0 | 13 |  |
Total assets | 1,552,604 | 1,481,376 |  |
Stockholders’ equity: |  |  |  |
Common stock, $0.001 par value; authorized 70,000,000 shares in 2020 and 2019; issued and outstanding 28,556,605 shares in 2020 and 28,456,508 shares in 2019 | 29 | 28 |  |
Additional paid-in capital | 510,158 | 506,639 |  |
Retained earnings | 408,037 | 383,191 |  |
Accumulated other comprehensive (loss) income | (1,064) | 126 |  |
Total stockholders’ equity | 917,160 | 889,984 |  |
Long-term debt, less current portion | 555,824 | 555,820 |  |
Capitalization, long-term debt and equity | 1,472,984 | 1,445,804 |  |
Current liabilities: |  |  |  |
Current portion of long-term debt | 49,929 | 0 |  |
Intercompany payables | 0 | 2,349 |  |
Intercompany notes payable | 19,540 | 24,465 |  |
Accounts payable | 170 | 1,042 |  |
Accrued interest | 3,195 | 3,748 |  |
Income tax payable | 3,268 | 0 |  |
Other current liabilities | 252 | 912 |  |
Total current liabilities | 76,354 | 32,516 |  |
Deferred income taxes | 2,623 | 1,994 |  |
Other noncurrent liabilities | 643 | 1,062 |  |
Commitments and contingencies | 0 | 0 |  |
Total equity and liabilities | $ 1,552,604 | $ 1,481,376 |  |
Common stock, par value (usd per share) | $ 0.001 | $ 0.001 |  |
Common stock, shares authorized (in shares) | 70,000,000 | 70,000,000 |  |
Common stock, shares issued (in shares) | 28,556,605 | 28,456,508 |  |
Common stock, shares outstanding (in shares) | 28,556,605 | 28,456,508 |  |

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