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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Condensed Consolidating Financial Statements |  |  |  |  |  |  |  |
Operating revenue | $ 232,537 |  |  | $ 221,288 |  |  | $ 537,679 | $ 530,779
Operations: |  |  |  |  |  |  |  |
Water production costs | 80,568 |  |  | 78,818 |  |  | 190,795 | 191,797
Administrative and general | 26,779 |  |  | 26,493 |  |  | 81,310 | 77,195
Other operations | 24,550 |  |  | 21,943 |  |  | 64,913 | 60,307
Maintenance | 7,065 |  |  | 6,768 |  |  | 19,212 | 17,596
Depreciation and amortization | 22,273 |  |  | 21,009 |  |  | 66,967 | 62,677
Income tax (benefit) expense | 12,194 |  |  | 11,786 |  |  | 13,524 | 16,950
Property and other taxes | 7,541 |  |  | 7,142 |  |  | 21,902 | 20,253
Total operating (income) expenses | 180,970 |  |  | 173,959 |  |  | 458,623 | 446,775
Net operating income | 51,567 |  |  | 47,329 |  |  | 79,056 | 84,004
Other income and expenses: |  |  |  |  |  |  |  |
Non-regulated revenue | 4,118 |  |  | 4,703 |  |  | 14,149 | 13,967
Non-regulated expenses | (4,351) |  |  | (4,897) |  |  | (10,470) | (16,449)
Other components of net periodic benefit cost | (1,857) |  |  | (1,975) |  |  | (4,308) | (6,984)
Allowance for equity funds used during construction | 1,868 |  |  | 1,023 |  |  | 5,087 | 2,644
Income tax benefit on other income and expenses | 330 |  |  | 305 |  |  | (985) | 1,882
Net other income (loss) | 108 |  |  | (841) |  |  | 3,473 | (4,940)
Interest expense: |  |  |  |  |  |  |  |
Interest expense | 10,279 |  |  | 10,875 |  |  | 33,532 | 30,207
Allowance for borrowed funds used during construction | (1,028) |  |  | (560) |  |  | (2,783) | (1,359)
Net interest expense | 9,251 |  |  | 10,315 |  |  | 30,749 | 28,848
Equity earnings of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Net income | 42,424 | $ 16,996 | $ (7,640) | 36,173 | $ 14,805 | $ (762) | 51,780 | 50,216
Consolidating Adjustments |  |  |  |  |  |  |  |
Condensed Consolidating Financial Statements |  |  |  |  |  |  |  |
Operating revenue | 0 |  |  | 0 |  |  | 0 | 0
Operations: |  |  |  |  |  |  |  |
Water production costs | 0 |  |  | 0 |  |  | 0 | 0
Administrative and general | 0 |  |  | 0 |  |  | 0 | 0
Other operations | (147) |  |  | (144) |  |  | (437) | (436)
Maintenance | 0 |  |  | 0 |  |  | 0 | 0
Depreciation and amortization | (21) |  |  | (22) |  |  | (62) | (65)
Income tax (benefit) expense | 215 |  |  | 222 |  |  | 651 | 620
Property and other taxes | 0 |  |  | 0 |  |  | 0 | 0
Total operating (income) expenses | 47 |  |  | 56 |  |  | 152 | 119
Net operating income | (47) |  |  | (56) |  |  | (152) | (119)
Other income and expenses: |  |  |  |  |  |  |  |
Non-regulated revenue | (745) |  |  | (773) |  |  | (2,263) | (2,152)
Non-regulated expenses | 0 |  |  | 0 |  |  | 0 | 0
Other components of net periodic benefit cost | 0 |  |  | 0 |  |  | 0 | 0
Allowance for equity funds used during construction | 0 |  |  | 0 |  |  | 0 | 0
Income tax benefit on other income and expenses | 208 |  |  | 216 |  |  | 633 | 602
Net other income (loss) | (537) |  |  | (557) |  |  | (1,630) | (1,550)
Interest expense: |  |  |  |  |  |  |  |
Interest expense | (599) |  |  | (628) |  |  | (1,826) | (1,716)
Allowance for borrowed funds used during construction | 0 |  |  | 0 |  |  | 0 | 0
Net interest expense | (599) |  |  | (628) |  |  | (1,826) | (1,716)
Equity earnings of subsidiaries | (42,334) |  |  | (36,088) |  |  | (51,523) | (49,863)
Net income | (42,319) |  |  | (36,073) |  |  | (51,479) | (49,816)
Parent Company | Reportable Legal Entities |  |  |  |  |  |  |  |
Condensed Consolidating Financial Statements |  |  |  |  |  |  |  |
Operating revenue | 0 |  |  | 0 |  |  | 0 | 0
Operations: |  |  |  |  |  |  |  |
Water production costs | 0 |  |  | 0 |  |  | 0 | 0
Administrative and general | 0 |  |  | 0 |  |  | 23 | 0
Other operations | 0 |  |  | 0 |  |  | 0 | 0
Maintenance | 0 |  |  | 0 |  |  | 0 | 0
Depreciation and amortization | 23 |  |  | 23 |  |  | 70 | 70
Income tax (benefit) expense | (132) |  |  | (142) |  |  | (411) | (342)
Property and other taxes | 0 |  |  | 0 |  |  | 0 | 0
Total operating (income) expenses | (109) |  |  | (119) |  |  | (318) | (272)
Net operating income | 109 |  |  | 119 |  |  | 318 | 272
Other income and expenses: |  |  |  |  |  |  |  |
Non-regulated revenue | 599 |  |  | 628 |  |  | 1,826 | 1,716
Non-regulated expenses | 0 |  |  | 0 |  |  | 0 | 0
Other components of net periodic benefit cost | 0 |  |  | 0 |  |  | 0 | 0
Allowance for equity funds used during construction | 0 |  |  | 0 |  |  | 0 | 0
Income tax benefit on other income and expenses | (168) |  |  | (176) |  |  | (511) | (480)
Net other income (loss) | 431 |  |  | 452 |  |  | 1,315 | 1,236
Interest expense: |  |  |  |  |  |  |  |
Interest expense | 450 |  |  | 486 |  |  | 1,376 | 1,155
Allowance for borrowed funds used during construction | 0 |  |  | 0 |  |  | 0 | 0
Net interest expense | 450 |  |  | 486 |  |  | 1,376 | 1,155
Equity earnings of subsidiaries | 42,334 |  |  | 36,088 |  |  | 51,523 | 49,863
Net income | 42,424 |  |  | 36,173 |  |  | 51,780 | 50,216
Cal Water | Reportable Legal Entities |  |  |  |  |  |  |  |
Condensed Consolidating Financial Statements |  |  |  |  |  |  |  |
Operating revenue | 219,261 |  |  | 208,695 |  |  | 502,785 | 499,173
Operations: |  |  |  |  |  |  |  |
Water production costs | 78,048 |  |  | 76,317 |  |  | 183,617 | 185,149
Administrative and general | 24,498 |  |  | 23,878 |  |  | 73,908 | 69,531
Other operations | 22,872 |  |  | 20,271 |  |  | 59,851 | 55,626
Maintenance | 6,823 |  |  | 6,538 |  |  | 18,469 | 16,974
Depreciation and amortization | 20,770 |  |  | 19,632 |  |  | 62,471 | 58,909
Income tax (benefit) expense | 11,332 |  |  | 10,435 |  |  | 12,019 | 15,081
Property and other taxes | 6,620 |  |  | 6,205 |  |  | 19,431 | 17,894
Total operating (income) expenses | 170,963 |  |  | 163,276 |  |  | 429,766 | 419,164
Net operating income | 48,298 |  |  | 45,419 |  |  | 73,019 | 80,009
Other income and expenses: |  |  |  |  |  |  |  |
Non-regulated revenue | 3,865 |  |  | 4,589 |  |  | 13,374 | 13,572
Non-regulated expenses | (3,907) |  |  | (4,675) |  |  | (9,610) | (15,943)
Other components of net periodic benefit cost | (1,784) |  |  | (1,834) |  |  | (4,177) | (6,618)
Allowance for equity funds used during construction | 1,868 |  |  | 1,023 |  |  | 5,087 | 2,644
Income tax benefit on other income and expenses | 268 |  |  | 252 |  |  | (1,028) | 1,776
Net other income (loss) | 310 |  |  | (645) |  |  | 3,646 | (4,569)
Interest expense: |  |  |  |  |  |  |  |
Interest expense | 9,820 |  |  | 10,443 |  |  | 32,141 | 29,095
Allowance for borrowed funds used during construction | (954) |  |  | (522) |  |  | (2,592) | (1,250)
Net interest expense | 8,866 |  |  | 9,921 |  |  | 29,549 | 27,845
Equity earnings of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Net income | 39,742 |  |  | 34,853 |  |  | 47,116 | 47,595
All Other Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |
Condensed Consolidating Financial Statements |  |  |  |  |  |  |  |
Operating revenue | 13,276 |  |  | 12,593 |  |  | 34,894 | 31,606
Operations: |  |  |  |  |  |  |  |
Water production costs | 2,520 |  |  | 2,501 |  |  | 7,178 | 6,648
Administrative and general | 2,281 |  |  | 2,615 |  |  | 7,379 | 7,664
Other operations | 1,825 |  |  | 1,816 |  |  | 5,499 | 5,117
Maintenance | 242 |  |  | 230 |  |  | 743 | 622
Depreciation and amortization | 1,501 |  |  | 1,376 |  |  | 4,488 | 3,763
Income tax (benefit) expense | 779 |  |  | 1,271 |  |  | 1,265 | 1,591
Property and other taxes | 921 |  |  | 937 |  |  | 2,471 | 2,359
Total operating (income) expenses | 10,069 |  |  | 10,746 |  |  | 29,023 | 27,764
Net operating income | 3,207 |  |  | 1,847 |  |  | 5,871 | 3,842
Other income and expenses: |  |  |  |  |  |  |  |
Non-regulated revenue | 399 |  |  | 259 |  |  | 1,212 | 831
Non-regulated expenses | (444) |  |  | (222) |  |  | (860) | (506)
Other components of net periodic benefit cost | (73) |  |  | (141) |  |  | (131) | (366)
Allowance for equity funds used during construction | 0 |  |  | 0 |  |  | 0 | 0
Income tax benefit on other income and expenses | 22 |  |  | 13 |  |  | (79) | (16)
Net other income (loss) | (96) |  |  | (91) |  |  | 142 | (57)
Interest expense: |  |  |  |  |  |  |  |
Interest expense | 608 |  |  | 574 |  |  | 1,841 | 1,673
Allowance for borrowed funds used during construction | (74) |  |  | (38) |  |  | (191) | (109)
Net interest expense | 534 |  |  | 536 |  |  | 1,650 | 1,564
Equity earnings of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Net income | $ 2,577 |  |  | $ 1,220 |  |  | $ 4,363 | $ 2,221

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