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Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | ---
Utility plant: |  |  |  |  |  |  |
Utility plant | $ 3,346,165 |  | $ 3,229,446 |  |  |  |
Less accumulated depreciation and amortization | (1,043,960) |  | (996,723) |  |  |  |
Net utility plant | 2,302,205 |  | 2,232,723 |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | 54,560 |  | 47,176 |  |  |  |
Receivables and unbilled revenue | 127,361 |  | 122,959 |  |  |  |
Receivables from affiliates | 0 |  | 0 |  |  |  |
Other current assets | 24,109 |  | 18,567 |  |  |  |
Total current assets | 206,030 |  | 188,702 |  |  |  |
Other assets: |  |  |  |  |  |  |
Regulatory assets | 373,619 |  | 353,569 |  |  |  |
Investments in affiliates | 0 |  | 0 |  |  |  |
Long-term affiliate notes receivable | 0 |  | 0 |  |  |  |
Other assets | 82,741 |  | 62,710 |  |  |  |
Total other assets | 456,360 |  | 416,279 |  |  |  |
TOTAL ASSETS | 2,964,595 |  | 2,837,704 |  |  |  |
Capitalization: |  |  |  |  |  |  |
Common stockholders' equity | 723,164 | $ 714,129 | 730,157 | $ 695,257 | $ 688,853 | $ 699,221 | $ 699,221
Affiliate long-term debt | 0 |  | 0 |  |  |  |
Long-term debt, net | 807,693 |  | 710,027 |  |  |  |
Total capitalization | 1,530,857 |  | 1,440,184 |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Current maturities of long-term debt, net | 5,312 |  | 104,911 |  |  |  |
Short-term borrowings | 165,100 |  | 65,100 |  |  |  |
Payables to affiliates | 0 |  | 0 |  |  |  |
Accounts payable | 97,376 |  | 95,580 |  |  |  |
Accrued expenses and other liabilities | 63,601 |  | 55,575 |  |  |  |
Total current liabilities | 331,389 |  | 321,166 |  |  |  |
Unamortized investment tax credits | 1,649 |  | 1,649 |  |  |  |
Deferred income taxes | 216,880 |  | 213,033 |  |  |  |
Pension and postretirement benefits other than pensions | 201,476 |  | 193,538 |  |  |  |
Regulatory liabilities and other | 264,027 |  | 256,522 |  |  |  |
Advances for construction | 189,642 |  | 186,342 |  |  |  |
Contributions in aid of construction | 228,675 |  | 225,270 |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | 2,964,595 |  | 2,837,704 |  |  |  |
Consolidating Adjustments |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |
Utility plant | (7,197) |  | (7,197) |  |  |  |
Less accumulated depreciation and amortization | 2,139 |  | 2,097 |  |  |  |
Net utility plant | (5,058) |  | (5,100) |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |  |
Receivables and unbilled revenue | 0 |  | 0 |  |  |  |
Receivables from affiliates | (28,422) |  | (25,453) |  |  |  |
Other current assets | 0 |  | 0 |  |  |  |
Total current assets | (28,422) |  | (25,453) |  |  |  |
Other assets: |  |  |  |  |  |  |
Regulatory assets | 0 |  | 0 |  |  |  |
Investments in affiliates | (723,345) |  | (733,156) |  |  |  |
Long-term affiliate notes receivable | (26,965) |  | (27,829) |  |  |  |
Other assets | (236) |  | (203) |  |  |  |
Total other assets | (750,546) |  | (761,188) |  |  |  |
TOTAL ASSETS | (784,026) |  | (791,741) |  |  |  |
Capitalization: |  |  |  |  |  |  |
Common stockholders' equity | (728,592) |  | (738,433) |  |  |  |
Affiliate long-term debt | 0 |  | (27,828) |  |  |  |
Long-term debt, net | (26,965) |  | 0 |  |  |  |
Total capitalization | (755,557) |  | (766,261) |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Current maturities of long-term debt, net | 0 |  | 0 |  |  |  |
Short-term borrowings | 0 |  | 0 |  |  |  |
Payables to affiliates | (28,422) |  | (25,453) |  |  |  |
Accounts payable | 0 |  | 0 |  |  |  |
Accrued expenses and other liabilities | 0 |  | 0 |  |  |  |
Total current liabilities | (28,422) |  | (25,453) |  |  |  |
Unamortized investment tax credits | 0 |  | 0 |  |  |  |
Deferred income taxes | (32) |  | (43) |  |  |  |
Pension and postretirement benefits other than pensions | 0 |  | 0 |  |  |  |
Regulatory liabilities and other | (15) |  | 16 |  |  |  |
Advances for construction | 0 |  | 0 |  |  |  |
Contributions in aid of construction | 0 |  | 0 |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | (784,026) |  | (791,741) |  |  |  |
Parent Company | Reportable Legal Entities |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |
Utility plant | 1,318 |  | 1,318 |  |  |  |
Less accumulated depreciation and amortization | (1,060) |  | (1,013) |  |  |  |
Net utility plant | 258 |  | 305 |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | 1,523 |  | 3,779 |  |  |  |
Receivables and unbilled revenue | 0 |  | 126 |  |  |  |
Receivables from affiliates | 27,087 |  | 21,318 |  |  |  |
Other current assets | 379 |  | 80 |  |  |  |
Total current assets | 28,989 |  | 25,303 |  |  |  |
Other assets: |  |  |  |  |  |  |
Regulatory assets | 0 |  | 0 |  |  |  |
Investments in affiliates | 723,345 |  | 733,156 |  |  |  |
Long-term affiliate notes receivable | 26,965 |  | 27,829 |  |  |  |
Other assets | 490 |  | 133 |  |  |  |
Total other assets | 750,800 |  | 761,118 |  |  |  |
TOTAL ASSETS | 780,047 |  | 786,726 |  |  |  |
Capitalization: |  |  |  |  |  |  |
Common stockholders' equity | 723,164 |  | 730,157 |  |  |  |
Affiliate long-term debt | 0 |  | 0 |  |  |  |
Long-term debt, net | 0 |  | 0 |  |  |  |
Total capitalization | 723,164 |  | 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 | 343 |  | 107 |  |  |  |
Total current liabilities | 55,443 |  | 55,224 |  |  |  |
Unamortized investment tax credits | 0 |  | 0 |  |  |  |
Deferred income taxes | 1,440 |  | 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 | 780,047 |  | 786,726 |  |  |  |
Cal Water | Reportable Legal Entities |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |
Utility plant | 3,132,488 |  | 3,021,437 |  |  |  |
Less accumulated depreciation and amortization | (981,960) |  | (938,072) |  |  |  |
Net utility plant | 2,150,528 |  | 2,083,365 |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | 44,079 |  | 33,763 |  |  |  |
Receivables and unbilled revenue | 121,618 |  | 118,632 |  |  |  |
Receivables from affiliates | 1,219 |  | 4,074 |  |  |  |
Other current assets | 21,840 |  | 16,907 |  |  |  |
Total current assets | 188,756 |  | 173,376 |  |  |  |
Other assets: |  |  |  |  |  |  |
Regulatory assets | 369,320 |  | 349,414 |  |  |  |
Investments in affiliates | 0 |  | 0 |  |  |  |
Long-term affiliate notes receivable | 0 |  | 0 |  |  |  |
Other assets | 77,721 |  | 58,959 |  |  |  |
Total other assets | 447,041 |  | 408,373 |  |  |  |
TOTAL ASSETS | 2,786,325 |  | 2,665,114 |  |  |  |
Capitalization: |  |  |  |  |  |  |
Common stockholders' equity | 648,366 |  | 659,340 |  |  |  |
Affiliate long-term debt | 0 |  | 0 |  |  |  |
Long-term debt, net | 807,163 |  | 709,444 |  |  |  |
Total capitalization | 1,455,529 |  | 1,368,784 |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Current maturities of long-term debt, net | 5,113 |  | 104,664 |  |  |  |
Short-term borrowings | 110,000 |  | 10,000 |  |  |  |
Payables to affiliates | 2,917 |  | 488 |  |  |  |
Accounts payable | 93,307 |  | 92,310 |  |  |  |
Accrued expenses and other liabilities | 59,872 |  | 53,655 |  |  |  |
Total current liabilities | 271,209 |  | 261,117 |  |  |  |
Unamortized investment tax credits | 1,649 |  | 1,649 |  |  |  |
Deferred income taxes | 213,236 |  | 210,052 |  |  |  |
Pension and postretirement benefits other than pensions | 201,476 |  | 193,538 |  |  |  |
Regulatory liabilities and other | 257,124 |  | 250,720 |  |  |  |
Advances for construction | 189,152 |  | 185,843 |  |  |  |
Contributions in aid of construction | 196,950 |  | 193,411 |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | 2,786,325 |  | 2,665,114 |  |  |  |
All Other Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |
Utility plant: |  |  |  |  |  |  |
Utility plant | 219,556 |  | 213,888 |  |  |  |
Less accumulated depreciation and amortization | (63,079) |  | (59,735) |  |  |  |
Net utility plant | 156,477 |  | 154,153 |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | 8,958 |  | 9,634 |  |  |  |
Receivables and unbilled revenue | 5,743 |  | 4,201 |  |  |  |
Receivables from affiliates | 116 |  | 61 |  |  |  |
Other current assets | 1,890 |  | 1,580 |  |  |  |
Total current assets | 16,707 |  | 15,476 |  |  |  |
Other assets: |  |  |  |  |  |  |
Regulatory assets | 4,299 |  | 4,155 |  |  |  |
Investments in affiliates | 0 |  | 0 |  |  |  |
Long-term affiliate notes receivable | 0 |  | 0 |  |  |  |
Other assets | 4,766 |  | 3,821 |  |  |  |
Total other assets | 9,065 |  | 7,976 |  |  |  |
TOTAL ASSETS | 182,249 |  | 177,605 |  |  |  |
Capitalization: |  |  |  |  |  |  |
Common stockholders' equity | 80,226 |  | 79,093 |  |  |  |
Affiliate long-term debt | 0 |  | 27,828 |  |  |  |
Long-term debt, net | 27,495 |  | 583 |  |  |  |
Total capitalization | 107,721 |  | 107,504 |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Current maturities of long-term debt, net | 199 |  | 247 |  |  |  |
Short-term borrowings | 0 |  | 0 |  |  |  |
Payables to affiliates | 25,505 |  | 24,948 |  |  |  |
Accounts payable | 4,069 |  | 3,270 |  |  |  |
Accrued expenses and other liabilities | 3,386 |  | 1,813 |  |  |  |
Total current liabilities | 33,159 |  | 30,278 |  |  |  |
Unamortized investment tax credits | 0 |  | 0 |  |  |  |
Deferred income taxes | 2,236 |  | 1,648 |  |  |  |
Pension and postretirement benefits other than pensions | 0 |  | 0 |  |  |  |
Regulatory liabilities and other | 6,918 |  | 5,817 |  |  |  |
Advances for construction | 490 |  | 499 |  |  |  |
Contributions in aid of construction | 31,725 |  | 31,859 |  |  |  |
TOTAL CAPITALIZATION AND LIABILITIES | $ 182,249 |  | $ 177,605 |  |  |  |

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