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Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Utility plant: |  |  |  |  |  |  |  |  |
Utility plant | $ 3,411,219 |  |  | $ 3,229,446 |  |  |  |  |
Less accumulated depreciation and amortization | (1,067,965) |  |  | (996,723) |  |  |  |  |
Net utility plant | 2,343,254 |  |  | 2,232,723 |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 51,257 |  |  | 47,176 |  |  |  |  |
Receivables and unbilled revenue | 138,600 |  |  | 122,959 |  |  |  |  |
Receivables from affiliates | 0 |  |  | 0 |  |  |  |  |
Other current assets | 22,199 |  |  | 18,567 |  |  |  |  |
Total current assets | 212,056 |  |  | 188,702 |  |  |  |  |
Other assets: |  |  |  |  |  |  |  |  |
Regulatory assets | 382,484 |  |  | 353,569 |  |  |  |  |
Investments in affiliates | 0 |  |  | 0 |  |  |  |  |
Long-term affiliate notes receivable | 0 |  |  | 0 |  |  |  |  |
Other assets | 85,460 |  |  | 62,710 |  |  |  |  |
Total other assets | 467,944 |  |  | 416,279 |  |  |  |  |
TOTAL ASSETS | 3,023,254 |  |  | 2,837,704 |  |  |  |  |
Capitalization: |  |  |  |  |  |  |  |  |
Common stockholders’ equity | 757,795 | $ 723,164 | $ 714,129 | 730,157 | $ 723,140 | $ 695,257 | $ 688,853 | $ 699,221 | $ 699,221
Affiliate long-term debt | 0 |  |  | 0 |  |  |  |  |
Long-term debt, net | 807,478 |  |  | 710,027 |  |  |  |  |
Total capitalization | 1,565,273 |  |  | 1,440,184 |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 5,280 |  |  | 104,911 |  |  |  |  |
Short-term borrowings | 155,100 |  |  | 65,100 |  |  |  |  |
Payables to affiliates | 0 |  |  | 0 |  |  |  |  |
Accounts payable | 108,593 |  |  | 95,580 |  |  |  |  |
Accrued expenses and other liabilities | 64,971 |  |  | 55,575 |  |  |  |  |
Total current liabilities | 333,944 |  |  | 321,166 |  |  |  |  |
Unamortized investment tax credits | 1,649 |  |  | 1,649 |  |  |  |  |
Deferred income taxes | 229,237 |  |  | 213,033 |  |  |  |  |
Pension and postretirement benefits other than pensions | 203,557 |  |  | 193,538 |  |  |  |  |
Regulatory liabilities and other | 260,812 |  |  | 256,522 |  |  |  |  |
Advances for construction | 190,272 |  |  | 186,342 |  |  |  |  |
Contributions in aid of construction | 238,510 |  |  | 225,270 |  |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | 3,023,254 |  |  | 2,837,704 |  |  |  |  |
Consolidating Adjustments |  |  |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |  |  |
Utility plant | (7,197) |  |  | (7,197) |  |  |  |  |
Less accumulated depreciation and amortization | 2,159 |  |  | 2,097 |  |  |  |  |
Net utility plant | (5,038) |  |  | (5,100) |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 0 |  |  | 0 |  |  |  |  |
Receivables and unbilled revenue | 0 |  |  | 0 |  |  |  |  |
Receivables from affiliates | (29,650) |  |  | (25,453) |  |  |  |  |
Other current assets | 0 |  |  | 0 |  |  |  |  |
Total current assets | (29,650) |  |  | (25,453) |  |  |  |  |
Other assets: |  |  |  |  |  |  |  |  |
Regulatory assets | 0 |  |  | 0 |  |  |  |  |
Investments in affiliates | (756,177) |  |  | (733,156) |  |  |  |  |
Long-term affiliate notes receivable | (26,288) |  |  | (27,829) |  |  |  |  |
Other assets | (214) |  |  | (203) |  |  |  |  |
Total other assets | (782,679) |  |  | (761,188) |  |  |  |  |
TOTAL ASSETS | (817,367) |  |  | (791,741) |  |  |  |  |
Capitalization: |  |  |  |  |  |  |  |  |
Common stockholders’ equity | (761,403) |  |  | (738,433) |  |  |  |  |
Affiliate long-term debt | (26,288) |  |  | (27,828) |  |  |  |  |
Long-term debt, net | 0 |  |  | 0 |  |  |  |  |
Total capitalization | (787,691) |  |  | (766,261) |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 0 |  |  | 0 |  |  |  |  |
Short-term borrowings | 0 |  |  | 0 |  |  |  |  |
Payables to affiliates | (29,650) |  |  | (25,453) |  |  |  |  |
Accounts payable | 0 |  |  | 0 |  |  |  |  |
Accrued expenses and other liabilities | 0 |  |  | 0 |  |  |  |  |
Total current liabilities | (29,650) |  |  | (25,453) |  |  |  |  |
Unamortized investment tax credits | 0 |  |  | 0 |  |  |  |  |
Deferred income taxes | 0 |  |  | (43) |  |  |  |  |
Pension and postretirement benefits other than pensions | (26) |  |  | 0 |  |  |  |  |
Regulatory liabilities and other | 0 |  |  | 16 |  |  |  |  |
Advances for construction | 0 |  |  | 0 |  |  |  |  |
Contributions in aid of construction | 0 |  |  | 0 |  |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | (817,367) |  |  | (791,741) |  |  |  |  |
Parent Company | Reportable Legal Entities |  |  |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |  |  |
Utility plant | 1,318 |  |  | 1,318 |  |  |  |  |
Less accumulated depreciation and amortization | (1,083) |  |  | (1,013) |  |  |  |  |
Net utility plant | 235 |  |  | 305 |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 2,408 |  |  | 3,779 |  |  |  |  |
Receivables and unbilled revenue | 0 |  |  | 126 |  |  |  |  |
Receivables from affiliates | 28,896 |  |  | 21,318 |  |  |  |  |
Other current assets | 235 |  |  | 80 |  |  |  |  |
Total current assets | 31,539 |  |  | 25,303 |  |  |  |  |
Other assets: |  |  |  |  |  |  |  |  |
Regulatory assets | 0 |  |  | 0 |  |  |  |  |
Investments in affiliates | 756,177 |  |  | 733,156 |  |  |  |  |
Long-term affiliate notes receivable | 26,288 |  |  | 27,829 |  |  |  |  |
Other assets | 460 |  |  | 133 |  |  |  |  |
Total other assets | 782,925 |  |  | 761,118 |  |  |  |  |
TOTAL ASSETS | 814,699 |  |  | 786,726 |  |  |  |  |
Capitalization: |  |  |  |  |  |  |  |  |
Common stockholders’ equity | 757,795 |  |  | 730,157 |  |  |  |  |
Affiliate long-term debt | 0 |  |  | 0 |  |  |  |  |
Long-term debt, net | 0 |  |  | 0 |  |  |  |  |
Total capitalization | 757,795 |  |  | 730,157 |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 0 |  |  | 0 |  |  |  |  |
Short-term borrowings | 55,100 |  |  | 55,100 |  |  |  |  |
Payables to affiliates | 0 |  |  | 17 |  |  |  |  |
Accounts payable | 0 |  |  | 0 |  |  |  |  |
Accrued expenses and other liabilities | 329 |  |  | 107 |  |  |  |  |
Total current liabilities | 55,429 |  |  | 55,224 |  |  |  |  |
Unamortized investment tax credits | 0 |  |  | 0 |  |  |  |  |
Deferred income taxes | 1,475 |  |  | 1,376 |  |  |  |  |
Pension and postretirement benefits other than pensions | 0 |  |  | 0 |  |  |  |  |
Regulatory liabilities and other | 0 |  |  | (31) |  |  |  |  |
Advances for construction | 0 |  |  | 0 |  |  |  |  |
Contributions in aid of construction | 0 |  |  | 0 |  |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | 814,699 |  |  | 786,726 |  |  |  |  |
Cal Water | Reportable Legal Entities |  |  |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |  |  |
Utility plant | 3,194,372 |  |  | 3,021,437 |  |  |  |  |
Less accumulated depreciation and amortization | (1,004,387) |  |  | (938,072) |  |  |  |  |
Net utility plant | 2,189,985 |  |  | 2,083,365 |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 39,187 |  |  | 33,763 |  |  |  |  |
Receivables and unbilled revenue | 133,281 |  |  | 118,632 |  |  |  |  |
Receivables from affiliates | 540 |  |  | 4,074 |  |  |  |  |
Other current assets | 19,435 |  |  | 16,907 |  |  |  |  |
Total current assets | 192,443 |  |  | 173,376 |  |  |  |  |
Other assets: |  |  |  |  |  |  |  |  |
Regulatory assets | 377,962 |  |  | 349,414 |  |  |  |  |
Investments in affiliates | 0 |  |  | 0 |  |  |  |  |
Long-term affiliate notes receivable | 0 |  |  | 0 |  |  |  |  |
Other assets | 80,480 |  |  | 58,959 |  |  |  |  |
Total other assets | 458,442 |  |  | 408,373 |  |  |  |  |
TOTAL ASSETS | 2,840,870 |  |  | 2,665,114 |  |  |  |  |
Capitalization: |  |  |  |  |  |  |  |  |
Common stockholders’ equity | 679,037 |  |  | 659,340 |  |  |  |  |
Affiliate long-term debt | 0 |  |  | 0 |  |  |  |  |
Long-term debt, net | 807,019 |  |  | 709,444 |  |  |  |  |
Total capitalization | 1,486,056 |  |  | 1,368,784 |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 5,122 |  |  | 104,664 |  |  |  |  |
Short-term borrowings | 100,000 |  |  | 10,000 |  |  |  |  |
Payables to affiliates | 4,906 |  |  | 488 |  |  |  |  |
Accounts payable | 103,748 |  |  | 92,310 |  |  |  |  |
Accrued expenses and other liabilities | 60,621 |  |  | 53,655 |  |  |  |  |
Total current liabilities | 274,397 |  |  | 261,117 |  |  |  |  |
Unamortized investment tax credits | 1,649 |  |  | 1,649 |  |  |  |  |
Deferred income taxes | 224,549 |  |  | 210,052 |  |  |  |  |
Pension and postretirement benefits other than pensions | 203,557 |  |  | 193,538 |  |  |  |  |
Regulatory liabilities and other | 253,843 |  |  | 250,720 |  |  |  |  |
Advances for construction | 189,781 |  |  | 185,843 |  |  |  |  |
Contributions in aid of construction | 207,038 |  |  | 193,411 |  |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | 2,840,870 |  |  | 2,665,114 |  |  |  |  |
All Other Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |  |  |
Utility plant | 222,726 |  |  | 213,888 |  |  |  |  |
Less accumulated depreciation and amortization | (64,654) |  |  | (59,735) |  |  |  |  |
Net utility plant | 158,072 |  |  | 154,153 |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 9,662 |  |  | 9,634 |  |  |  |  |
Receivables and unbilled revenue | 5,319 |  |  | 4,201 |  |  |  |  |
Receivables from affiliates | 214 |  |  | 61 |  |  |  |  |
Other current assets | 2,529 |  |  | 1,580 |  |  |  |  |
Total current assets | 17,724 |  |  | 15,476 |  |  |  |  |
Other assets: |  |  |  |  |  |  |  |  |
Regulatory assets | 4,522 |  |  | 4,155 |  |  |  |  |
Investments in affiliates | 0 |  |  | 0 |  |  |  |  |
Long-term affiliate notes receivable | 0 |  |  | 0 |  |  |  |  |
Other assets | 4,692 |  |  | 3,821 |  |  |  |  |
Total other assets | 9,214 |  |  | 7,976 |  |  |  |  |
TOTAL ASSETS | 185,010 |  |  | 177,605 |  |  |  |  |
Capitalization: |  |  |  |  |  |  |  |  |
Common stockholders’ equity | 82,366 |  |  | 79,093 |  |  |  |  |
Affiliate long-term debt | 26,288 |  |  | 27,828 |  |  |  |  |
Long-term debt, net | 459 |  |  | 583 |  |  |  |  |
Total capitalization | 109,113 |  |  | 107,504 |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Current maturities of long-term debt, net | 158 |  |  | 247 |  |  |  |  |
Short-term borrowings | 0 |  |  | 0 |  |  |  |  |
Payables to affiliates | 24,744 |  |  | 24,948 |  |  |  |  |
Accounts payable | 4,845 |  |  | 3,270 |  |  |  |  |
Accrued expenses and other liabilities | 4,021 |  |  | 1,813 |  |  |  |  |
Total current liabilities | 33,768 |  |  | 30,278 |  |  |  |  |
Unamortized investment tax credits | 0 |  |  | 0 |  |  |  |  |
Deferred income taxes | 3,213 |  |  | 1,648 |  |  |  |  |
Pension and postretirement benefits other than pensions | 0 |  |  | 0 |  |  |  |  |
Regulatory liabilities and other | 6,953 |  |  | 5,817 |  |  |  |  |
Advances for construction | 491 |  |  | 499 |  |  |  |  |
Contributions in aid of construction | 31,472 |  |  | 31,859 |  |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | $ 185,010 |  |  | $ 177,605 |  |  |  |  |

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