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Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | --- | ---
Utility plant: |  |  |  |  |  |  |  |
Utility plant | $ 3,835,194 |  |  | $ 3,550,485 |  |  |  |
Less accumulated depreciation and amortization | (1,238,880) |  |  | (1,144,115) |  |  |  |
Net utility plant | 2,596,314 |  |  | 2,406,370 |  |  |  |
Current assets: |  |  |  |  |  |  |  |
Cash and cash equivalents | 113,312 |  |  | 42,653 |  |  |  |
Receivables and unbilled revenue, net | 169,115 |  |  | 119,349 |  |  |  |
Receivables from affiliates | 0 |  |  | 0 |  |  |  |
Other current assets | 23,337 |  |  | 22,710 |  |  |  |
Total current assets | 305,764 |  |  | 184,712 |  |  |  |
Other assets: |  |  |  |  |  |  |  |
Regulatory assets | 484,435 |  |  | 433,322 |  |  |  |
Investments in affiliates | 0 |  |  | 0 |  |  |  |
Long-term affiliate notes receivable | 0 |  |  | 0 |  |  |  |
Other assets | 119,921 |  |  | 86,904 |  |  |  |
Total other assets | 604,356 |  |  | 520,226 |  |  |  |
TOTAL ASSETS | 3,506,434 |  |  | 3,111,308 |  |  |  |
Capitalization: |  |  |  |  |  |  |  |
Common stockholders’ equity | 890,192 | $ 782,023 | $ 755,140 | 779,906 | $ 757,795 | $ 723,164 | $ 714,129 | $ 730,157
Affiliate long-term debt | 0 |  |  | 0 |  |  |  |
Long-term debt, net | 785,055 |  |  | 786,754 |  |  |  |
Total capitalization | 1,675,247 |  |  | 1,566,660 |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 21,883 |  |  | 21,868 |  |  |  |
Short-term borrowings | 375,100 |  |  | 175,100 |  |  |  |
Payables to affiliates | 0 |  |  | 0 |  |  |  |
Accounts payable | 127,158 |  |  | 108,463 |  |  |  |
Accrued expenses and other liabilities | 79,682 |  |  | 53,290 |  |  |  |
Total current liabilities | 603,823 |  |  | 358,721 |  |  |  |
Deferred income taxes | 245,456 |  |  | 222,590 |  |  |  |
Pension and postretirement benefits other than pensions | 261,081 |  |  | 258,907 |  |  |  |
Regulatory liabilities and other | 257,054 |  |  | 271,831 |  |  |  |
Advances for construction | 196,853 |  |  | 191,062 |  |  |  |
Contributions in aid of construction | 266,920 |  |  | 241,537 |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | 3,506,434 |  |  | 3,111,308 |  |  |  |
Consolidating Adjustments |  |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |  |
Utility plant | (7,197) |  |  | (7,197) |  |  |  |
Less accumulated depreciation and amortization | 2,239 |  |  | 2,180 |  |  |  |
Net utility plant | (4,958) |  |  | (5,017) |  |  |  |
Current assets: |  |  |  |  |  |  |  |
Cash and cash equivalents | 0 |  |  | 0 |  |  |  |
Receivables and unbilled revenue, net | 0 |  |  | 0 |  |  |  |
Receivables from affiliates | (28,165) |  |  | (29,633) |  |  |  |
Other current assets | 0 |  |  | 0 |  |  |  |
Total current assets | (28,165) |  |  | (29,633) |  |  |  |
Other assets: |  |  |  |  |  |  |  |
Regulatory assets | 0 |  |  | 0 |  |  |  |
Investments in affiliates | (917,901) |  |  | (777,170) |  |  |  |
Long-term affiliate notes receivable | (32,659) |  |  | (30,060) |  |  |  |
Other assets | (218) |  |  | (221) |  |  |  |
Total other assets | (950,778) |  |  | (807,451) |  |  |  |
TOTAL ASSETS | (983,901) |  |  | (842,101) |  |  |  |
Capitalization: |  |  |  |  |  |  |  |
Common stockholders’ equity | (923,077) |  |  | (782,388) |  |  |  |
Affiliate long-term debt | (32,659) |  |  | (30,060) |  |  |  |
Long-term debt, net | 0 |  |  | 0 |  |  |  |
Total capitalization | (955,736) |  |  | (812,448) |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 0 |  |  | 0 |  |  |  |
Short-term borrowings | 0 |  |  | 0 |  |  |  |
Payables to affiliates | (28,165) |  |  | (29,633) |  |  |  |
Accounts payable | 0 |  |  | 0 |  |  |  |
Accrued expenses and other liabilities | 0 |  |  | 0 |  |  |  |
Total current liabilities | (28,165) |  |  | (29,633) |  |  |  |
Deferred income taxes | 0 |  |  | (20) |  |  |  |
Pension and postretirement benefits other than pensions | 0 |  |  | 0 |  |  |  |
Regulatory liabilities and other | 0 |  |  | 0 |  |  |  |
Advances for construction | 0 |  |  | 0 |  |  |  |
Contributions in aid of construction | 0 |  |  | 0 |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | (983,901) |  |  | (842,101) |  |  |  |
Parent Company | Reportable Legal Entities |  |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |  |
Utility plant | 1,318 |  |  | 1,318 |  |  |  |
Less accumulated depreciation and amortization | (1,177) |  |  | (1,107) |  |  |  |
Net utility plant | 141 |  |  | 211 |  |  |  |
Current assets: |  |  |  |  |  |  |  |
Cash and cash equivalents | 16,679 |  |  | 3,096 |  |  |  |
Receivables and unbilled revenue, net | 0 |  |  | 0 |  |  |  |
Receivables from affiliates | 26,962 |  |  | 25,803 |  |  |  |
Other current assets | 272 |  |  | 90 |  |  |  |
Total current assets | 43,913 |  |  | 28,989 |  |  |  |
Other assets: |  |  |  |  |  |  |  |
Regulatory assets | 0 |  |  | 0 |  |  |  |
Investments in affiliates | 917,901 |  |  | 777,170 |  |  |  |
Long-term affiliate notes receivable | 32,659 |  |  | 30,060 |  |  |  |
Other assets | 2,349 |  |  | 409 |  |  |  |
Total other assets | 952,909 |  |  | 807,639 |  |  |  |
TOTAL ASSETS | 996,963 |  |  | 836,839 |  |  |  |
Capitalization: |  |  |  |  |  |  |  |
Common stockholders’ equity | 890,192 |  |  | 779,906 |  |  |  |
Affiliate long-term debt | 0 |  |  | 0 |  |  |  |
Long-term debt, net | 0 |  |  | 0 |  |  |  |
Total capitalization | 890,192 |  |  | 779,906 |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 0 |  |  | 0 |  |  |  |
Short-term borrowings | 105,100 |  |  | 55,100 |  |  |  |
Payables to affiliates | 0 |  |  | 0 |  |  |  |
Accounts payable | 0 |  |  | 0 |  |  |  |
Accrued expenses and other liabilities | 31 |  |  | 313 |  |  |  |
Total current liabilities | 105,131 |  |  | 55,413 |  |  |  |
Deferred income taxes | 1,640 |  |  | 1,520 |  |  |  |
Pension and postretirement benefits other than pensions | 0 |  |  | 0 |  |  |  |
Regulatory liabilities and other | 0 |  |  | 0 |  |  |  |
Advances for construction | 0 |  |  | 0 |  |  |  |
Contributions in aid of construction | 0 |  |  | 0 |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | 996,963 |  |  | 836,839 |  |  |  |
Cal Water | Reportable Legal Entities |  |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |  |
Utility plant | 3,559,329 |  |  | 3,332,331 |  |  |  |
Less accumulated depreciation and amortization | (1,151,266) |  |  | (1,079,627) |  |  |  |
Net utility plant | 2,408,063 |  |  | 2,252,704 |  |  |  |
Current assets: |  |  |  |  |  |  |  |
Cash and cash equivalents | 85,877 |  |  | 29,098 |  |  |  |
Receivables and unbilled revenue, net | 160,479 |  |  | 114,999 |  |  |  |
Receivables from affiliates | 942 |  |  | 3,621 |  |  |  |
Other current assets | 20,933 |  |  | 20,615 |  |  |  |
Total current assets | 268,231 |  |  | 168,333 |  |  |  |
Other assets: |  |  |  |  |  |  |  |
Regulatory assets | 479,613 |  |  | 428,639 |  |  |  |
Investments in affiliates | 0 |  |  | 0 |  |  |  |
Long-term affiliate notes receivable | 0 |  |  | 0 |  |  |  |
Other assets | 84,154 |  |  | 81,591 |  |  |  |
Total other assets | 563,767 |  |  | 510,230 |  |  |  |
TOTAL ASSETS | 3,240,061 |  |  | 2,931,267 |  |  |  |
Capitalization: |  |  |  |  |  |  |  |
Common stockholders’ equity | 805,444 |  |  | 700,784 |  |  |  |
Affiliate long-term debt | 0 |  |  | 0 |  |  |  |
Long-term debt, net | 784,715 |  |  | 786,310 |  |  |  |
Total capitalization | 1,590,159 |  |  | 1,487,094 |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 21,763 |  |  | 21,732 |  |  |  |
Short-term borrowings | 270,000 |  |  | 120,000 |  |  |  |
Payables to affiliates | 2,940 |  |  | 6,115 |  |  |  |
Accounts payable | 123,129 |  |  | 104,419 |  |  |  |
Accrued expenses and other liabilities | 73,913 |  |  | 50,569 |  |  |  |
Total current liabilities | 491,745 |  |  | 302,835 |  |  |  |
Deferred income taxes | 235,791 |  |  | 217,847 |  |  |  |
Pension and postretirement benefits other than pensions | 261,081 |  |  | 258,907 |  |  |  |
Regulatory liabilities and other | 251,230 |  |  | 264,434 |  |  |  |
Advances for construction | 196,324 |  |  | 190,568 |  |  |  |
Contributions in aid of construction | 213,731 |  |  | 209,582 |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | 3,240,061 |  |  | 2,931,267 |  |  |  |
All Other Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |  |
Utility plant | 281,744 |  |  | 224,033 |  |  |  |
Less accumulated depreciation and amortization | (88,676) |  |  | (65,561) |  |  |  |
Net utility plant | 193,068 |  |  | 158,472 |  |  |  |
Current assets: |  |  |  |  |  |  |  |
Cash and cash equivalents | 10,756 |  |  | 10,459 |  |  |  |
Receivables and unbilled revenue, net | 8,636 |  |  | 4,350 |  |  |  |
Receivables from affiliates | 261 |  |  | 209 |  |  |  |
Other current assets | 2,132 |  |  | 2,005 |  |  |  |
Total current assets | 21,785 |  |  | 17,023 |  |  |  |
Other assets: |  |  |  |  |  |  |  |
Regulatory assets | 4,822 |  |  | 4,683 |  |  |  |
Investments in affiliates | 0 |  |  | 0 |  |  |  |
Long-term affiliate notes receivable | 0 |  |  | 0 |  |  |  |
Other assets | 33,636 |  |  | 5,125 |  |  |  |
Total other assets | 38,458 |  |  | 9,808 |  |  |  |
TOTAL ASSETS | 253,311 |  |  | 185,303 |  |  |  |
Capitalization: |  |  |  |  |  |  |  |
Common stockholders’ equity | 117,633 |  |  | 81,604 |  |  |  |
Affiliate long-term debt | 32,659 |  |  | 30,060 |  |  |  |
Long-term debt, net | 340 |  |  | 444 |  |  |  |
Total capitalization | 150,632 |  |  | 112,108 |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 120 |  |  | 136 |  |  |  |
Short-term borrowings | 0 |  |  | 0 |  |  |  |
Payables to affiliates | 25,225 |  |  | 23,518 |  |  |  |
Accounts payable | 4,029 |  |  | 4,044 |  |  |  |
Accrued expenses and other liabilities | 5,738 |  |  | 2,408 |  |  |  |
Total current liabilities | 35,112 |  |  | 30,106 |  |  |  |
Deferred income taxes | 8,025 |  |  | 3,243 |  |  |  |
Pension and postretirement benefits other than pensions | 0 |  |  | 0 |  |  |  |
Regulatory liabilities and other | 5,824 |  |  | 7,397 |  |  |  |
Advances for construction | 529 |  |  | 494 |  |  |  |
Contributions in aid of construction | 53,189 |  |  | 31,955 |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | $ 253,311 |  |  | $ 185,303 |  |  |  |

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