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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | $ 12,868,000 | $ 21,006,000 | $ 22,792,000 | $ 12,701,000 | $ 11,212,000 | $ 21,639,000 | $ 16,742,000 | $ 10,150,000 | $ 69,367,000 | $ 59,743,000 | $ 60,484,000 |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents | 214,000 |  |  |  | 436,000 |  |  |  | 214,000 | 436,000 | 4,364,000 |
Income taxes receivable and other receivables | 4,737,000 |  |  |  | 17,867,000 |  |  |  | 4,737,000 | 17,867,000 |  |
Total current assets | 155,463,000 |  |  |  | 166,875,000 |  |  |  | 155,463,000 | 166,875,000 |  |
Other assets | 5,667,000 |  |  |  | 5,068,000 |  |  |  | 5,667,000 | 5,068,000 |  |
Total Assets | 1,416,734,000 |  |  |  | 1,470,493,000 |  |  |  | 1,416,734,000 | 1,470,493,000 |  |
Liabilities and Capitalization |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | 59,000,000 |  |  |  | 90,000,000 |  |  |  | 59,000,000 | 90,000,000 |  |
Income taxes payable | 225,000 |  |  |  | 149,000 |  |  |  | 225,000 | 149,000 |  |
Other Liabilities, Current | 15,109,000 |  |  |  | 11,297,000 |  |  |  | 15,109,000 | 11,297,000 |  |
Other | 156,662,000 |  |  |  | 177,944,000 |  |  |  | 156,662,000 | 177,944,000 |  |
Deferred taxes | 115,703,000 |  |  |  | 224,530,000 |  |  |  | 115,703,000 | 224,530,000 |  |
Other | 409,088,000 |  |  |  | 477,271,000 |  |  |  | 409,088,000 | 477,271,000 |  |
Common shareholders' equity | 529,945,000 |  |  |  | 494,297,000 |  |  |  | 529,945,000 | 494,297,000 | 465,945,000 | $ 506,801,000
Total Capitalization and Liabilities | 1,416,734,000 |  |  |  | 1,470,493,000 |  |  |  | 1,416,734,000 | 1,470,493,000 |  |
Total capitalization | 850,984,000 |  |  |  | 815,278,000 |  |  |  | 850,984,000 | 815,278,000 |  |
AWR |  |  |  |  |  |  |  |  |  |  |  |
Condensed balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  | 69,367,000 | 59,743,000 | 60,484,000 |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents | 48,000 |  |  |  | 32,000 |  |  |  | 48,000 | 32,000 |  |
Inter-company loan receivables | 45,955,000 |  |  |  | 76,931,000 |  |  |  | 45,955,000 | 76,931,000 |  |
Total current assets | 46,003,000 |  |  |  | 76,963,000 |  |  |  | 46,003,000 | 76,963,000 |  |
Investments in subsidiaries | 539,332,000 |  |  |  | 506,584,000 |  |  |  | 539,332,000 | 506,584,000 |  |
Other assets | 8,422,000 |  |  |  | 6,964,000 |  |  |  | 8,422,000 | 6,964,000 |  |
Total Assets | 593,757,000 |  |  |  | 590,511,000 |  |  |  | 593,757,000 | 590,511,000 |  |
Liabilities and Capitalization |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | 59,000,000 |  |  |  | 90,000,000 |  |  |  | 59,000,000 | 90,000,000 |  |
Income taxes payable | 2,780,000 |  |  |  | 4,043,000 |  |  |  | 2,780,000 | 4,043,000 |  |
Inter-company payable to Parent | 73,000 |  |  |  | 0 |  |  |  | 73,000 | 0 |  |
Other Liabilities, Current | 509,000 |  |  |  | 517,000 |  |  |  | 509,000 | 517,000 |  |
Other | 62,362,000 |  |  |  | 94,560,000 |  |  |  | 62,362,000 | 94,560,000 |  |
Other | 1,450,000 |  |  |  | 1,654,000 |  |  |  | 1,450,000 | 1,654,000 |  |
Income taxes payable and other liabilities | 1,450,000 |  |  |  | 1,654,000 |  |  |  | 1,450,000 | 1,654,000 |  |
Common shareholders' equity | 529,945,000 |  |  |  | 494,297,000 |  |  |  | 529,945,000 | 494,297,000 |  |
Total Capitalization and Liabilities | 593,757,000 |  |  |  | 590,511,000 |  |  |  | 593,757,000 | 590,511,000 |  |
Total capitalization | 529,945,000 |  |  |  | 494,297,000 |  |  |  | 529,945,000 | 494,297,000 |  |
Golden State Water Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 7,309,000 | $ 17,336,000 | $ 18,363,000 | $ 10,749,000 | 6,432,000 | $ 17,883,000 | $ 13,670,000 | $ 8,984,000 | 53,757,000 | 46,969,000 | 47,591,000 |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents | 214,000 |  |  |  | 209,000 |  |  |  | 214,000 | 209,000 |  |
Income taxes receivable and other receivables | 6,590,000 |  |  |  | 21,856,000 |  |  |  | 6,590,000 | 21,856,000 |  |
Total current assets | 101,244,000 |  |  |  | 112,257,000 |  |  |  | 101,244,000 | 112,257,000 |  |
Other assets | 5,683,000 |  |  |  | 4,906,000 |  |  |  | 5,683,000 | 4,906,000 |  |
Total Assets | 1,326,823,000 |  |  |  | 1,384,178,000 |  |  |  | 1,326,823,000 | 1,384,178,000 |  |
Liabilities and Capitalization |  |  |  |  |  |  |  |  |  |  |  |
Inter-company payable to Parent | 34,836,000 |  |  |  | 61,726,000 |  |  |  | 34,836,000 | 61,726,000 |  |
Other Liabilities, Current | 14,705,000 |  |  |  | 10,925,000 |  |  |  | 14,705,000 | 10,925,000 |  |
Other | 117,334,000 |  |  |  | 135,971,000 |  |  |  | 117,334,000 | 135,971,000 |  |
Deferred taxes | 120,780,000 |  |  |  | 227,798,000 |  |  |  | 120,780,000 | 227,798,000 |  |
Other | 414,076,000 |  |  |  | 480,456,000 |  |  |  | 414,076,000 | 480,456,000 |  |
Common shareholders' equity | 474,374,000 |  |  |  | 446,770,000 |  |  |  | 474,374,000 | 446,770,000 | $ 423,730,000 | $ 435,190,000
Total Capitalization and Liabilities | 1,326,823,000 |  |  |  | 1,384,178,000 |  |  |  | 1,326,823,000 | 1,384,178,000 |  |
Total capitalization | 795,413,000 |  |  |  | 767,751,000 |  |  |  | 795,413,000 | 767,751,000 |  |
Notes Payable, Other Payables [Member] | Notes Receivable | Golden State Water Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Notes Receivable, Related Parties, Current | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |  |
Syndicated Revolving Credit Facility [Member] | AWR |  |  |  |  |  |  |  |  |  |  |  |
Condensed balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Total funded debt ratio |  |  |  |  |  |  |  |  | 42.00% |  |  |
Minimum [Member] | Syndicated Revolving Credit Facility [Member] | AWR |  |  |  |  |  |  |  |  |  |  |  |
Condensed balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Total funded debt ratio |  |  |  |  |  |  |  |  | 65.00% |  |  |
Maximum | Syndicated Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Total funded debt ratio |  |  |  |  |  |  |  |  | 65.00% |  |  |
Maximum | Syndicated Revolving Credit Facility [Member] | AWR |  |  |  |  |  |  |  |  |  |  |  |
Condensed balance sheet |  |  |  |  |  |  |  |  |  |  |  |
Total funded debt ratio |  |  |  |  |  |  |  |  | 100.00% |  |  |

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