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Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Details of reportable segment |  |  |  |  |  |
Operating revenues | $ 472,077 |  | $ 466,908 |  | $ 419,913 |
Operating income (loss) | 119,072 |  | 111,094 |  | 95,104 | [1]
Interest expense, net | (21,708) |  | (21,432) |  | (22,822) |
Utility Plant | 981,477 |  | 917,791 |  | 896,500 |
Depreciation and amortization expense | 40,090 | [2] | 41,385 | [2] | 38,349 | [2]
Income tax expense/(benefit) | 35,783 |  | 35,945 |  | 30,076 |
Income (loss) from discontinued operations |  |  |  |  | 3,849 | [3]
Capital additions | 97,379 |  | 68,104 |  | 80,281 |
Contracts |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Operating income (loss) | 24,608 |  | 11,855 |  |  |
GSWC |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Number of reportable segments | 2 |  |  |  |  |
Operating revenues | 358,540 |  | 342,931 |  | 336,725 |
Operating income (loss) | 102,343 |  | 86,605 |  | 83,678 |
Utility Plant | 977,294 |  | 913,137 |  |  |
Depreciation and amortization expense | 38,952 |  | 40,197 |  | 37,461 |
Income tax expense/(benefit) | 33,134 |  | 26,500 |  | 25,971 |
GSWC | Water |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Operating revenues | 320,131 |  | 305,898 |  | 300,450 |
Operating income (loss) | 95,932 |  | 78,104 |  | 77,017 | [1]
Interest expense, net | (20,236) |  | (19,783) |  | (20,990) |
Utility Plant | 936,386 |  | 871,756 |  | 852,264 |
Depreciation and amortization expense | 36,636 | [2] | 37,905 | [2] | 35,450 | [2]
Income tax expense/(benefit) | 30,679 |  | 24,231 |  | 24,151 |
Income (loss) from discontinued operations |  |  |  |  | 0 | [3]
Capital additions | 94,581 |  | 62,500 |  | 73,991 |
GSWC | Electric |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Operating revenues | 38,409 |  | 37,033 |  | 36,275 |
Operating income (loss) | 6,411 |  | 8,501 |  | 6,661 | [1]
Interest expense, net | (1,436) |  | (1,533) |  | (1,501) |
Utility Plant | 40,908 |  | 41,381 |  | 39,681 |
Depreciation and amortization expense | 2,316 | [2] | 2,292 | [2] | 2,011 | [2]
Income tax expense/(benefit) | 2,455 |  | 2,269 |  | 1,820 |
Income (loss) from discontinued operations |  |  |  |  | 0 | [3]
Capital additions | 2,124 |  | 4,331 |  | 4,447 |
CCWC | Water |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Operating revenues |  |  |  |  | 0 |
Operating income (loss) |  |  |  |  | (356) | [1]
Interest expense, net |  |  |  |  | 0 |
Utility Plant |  |  |  |  | 0 |
Depreciation and amortization expense |  |  |  |  | 0 | [2]
Income tax expense/(benefit) |  |  |  |  | (145) |
Income (loss) from discontinued operations |  |  |  |  | 1,612 | [3]
Capital additions |  |  |  |  | 0 |
ASUS | Water |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Operating revenues |  |  | 123,977 |  |  |
Operating income (loss) |  |  | 24,608 |  |  |
Interest expense, net |  |  | (179) |  |  |
Utility Plant |  |  | 4,654 |  |  |
Depreciation and amortization expense |  |  | 1,188 | [2] |  |
Income tax expense/(benefit) |  |  | 9,437 |  |  |
Capital additions |  |  | 1,273 |  |  |
ASUS | Contracts |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Operating revenues | 113,537 |  |  |  | 83,188 |
Operating income (loss) | 16,737 |  |  |  | 11,855 | [1]
Interest expense, net | (264) |  |  |  | (372) |
Utility Plant | 4,183 |  |  |  | 4,555 |
Depreciation and amortization expense | 1,138 | [2] |  |  | 888 | [2]
Income tax expense/(benefit) | 4,911 |  |  |  | 4,431 |
Income (loss) from discontinued operations |  |  |  |  | 0 | [3]
Capital additions | 674 |  |  |  | 1,843 |
AWR Parent |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Number of principal business units | 3 |  |  |  |  |
Operating revenues | 0 |  | 0 |  | 0 |
Operating income (loss) | (8) |  | (119) |  | (73) | [1]
Interest expense, net | 228 |  | 63 |  | 41 |
Utility Plant | 0 |  | 0 |  | 0 |
Depreciation and amortization expense | 0 | [2] | 0 | [2] | 0 | [2]
Income tax expense/(benefit) | (2,262) |  | 8 |  | (181) |
Income (loss) from discontinued operations |  |  |  |  | 2,237 | [3],[4]
Capital additions | $ 0 |  | $ 0 |  | $ 0 |
[1] | (2) Operating income (loss) includes CCWC’s allocated corporate overhead costs that are now primarily at GSWC.
[2] | Depreciation computed on GSWC’s transportation equipment is recorded in other operating expenses and totaled $877,000, $1.8 million and $2.5 million for the years ended December 31, 2013, 2012 and 2011, respectively.
[3] | (3) In accordance with the accounting guidance relating to assets held for sale, Registrant did not record depreciation expense for CCWC in 2012.
[4] | Included in discontinued operations for the year ended December 31, 2011 are direct transaction costs of $449,000 ($217,000 after tax) for legal and consulting services in connection with the sale of CCWC.

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- Definition Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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