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Business Segments: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Details of reportable segment |  |  |  |  |  |  |  |  |
Operating revenues | $ 120,695 |  | $ 114,582 |  | $ 231,247 |  | $ 221,474 |  |
Operating income (loss) | 33,294 |  | 30,125 |  | 61,257 |  | 53,492 |  |
Interest expense, net | 5,628 |  | 5,225 |  | 11,219 |  | 11,080 |  |
Utility Plant | 946,740 |  | 900,009 |  | 946,740 |  | 900,009 |  | 917,791
Depreciation and amortization expense | 9,768 | [1] | 10,407 | [1] | 19,584 | [1] | 20,897 | [1] |
Income tax expense (benefit) | 11,148 |  | 9,809 |  | 20,397 |  | 17,435 |  |
Capital additions | 22,910 |  | 14,480 |  | 41,189 |  | 29,447 |  |
GSWC |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  | 2 |  |  |  |
Operating revenues | 92,466 |  | 89,530 |  | 172,433 |  | 166,544 |  |
Operating income (loss) | 28,958 |  | 24,150 |  | 52,554 |  | 42,857 |  |
Utility Plant | 942,498 |  |  |  | 942,498 |  |  |  | 913,137
Depreciation and amortization expense | 9,484 |  | 10,122 |  | 19,006 |  | 20,342 |  |
Income tax expense (benefit) | 9,643 |  | 7,567 |  | 17,306 |  | 13,322 |  |
GSWC | Water |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |
Operating revenues | 84,069 |  | 81,157 |  | 153,302 |  | 147,358 |  |
Operating income (loss) | 26,772 |  | 22,666 |  | 48,535 |  | 37,517 |  |
Interest expense, net | 5,208 |  | 4,815 |  | 10,402 |  | 10,221 |  |
Utility Plant | 901,505 |  | 855,742 |  | 901,505 |  | 855,742 |  |
Depreciation and amortization expense | 8,909 | [1] | 9,525 | [1] | 17,839 | [1] | 19,122 | [1] |
Income tax expense (benefit) | 8,821 |  | 7,208 |  | 15,762 |  | 11,563 |  |
Capital additions | 22,263 |  | 13,544 |  | 40,141 |  | 27,484 |  |
GSWC | Electric |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |
Operating revenues | 8,397 |  | 8,373 |  | 19,131 |  | 19,186 |  |
Operating income (loss) | 2,186 |  | 1,484 |  | 4,019 |  | 5,340 |  |
Interest expense, net | 378 |  | 396 |  | 754 |  | 789 |  |
Utility Plant | 40,993 |  | 39,541 |  | 40,993 |  | 39,541 |  |
Depreciation and amortization expense | 575 | [1] | 597 | [1] | 1,167 | [1] | 1,220 | [1] |
Income tax expense (benefit) | 822 |  | 359 |  | 1,544 |  | 1,759 |  |
Capital additions | 647 |  | 705 |  | 880 |  | 1,244 |  |
ASUS | Contracts |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |
Operating revenues | 28,229 |  | 25,052 |  | 58,814 |  | 54,930 |  |
Operating income (loss) | 4,343 |  | 5,989 |  | 8,710 |  | 10,730 |  |
Interest expense, net | 93 |  | 40 |  | 153 |  | 94 |  |
Utility Plant | 4,242 |  | 4,726 |  | 4,242 |  | 4,726 |  |
Depreciation and amortization expense | 284 | [1] | 285 | [1] | 578 | [1] | 555 | [1] |
Income tax expense (benefit) | 1,628 |  | 2,313 |  | 3,294 |  | 4,143 |  |
Capital additions | 0 |  | 231 |  | 168 |  | 719 |  |
AWR Parent |  |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  | 3 |  |  |  |
Operating revenues | 0 |  | 0 |  | 0 |  | 0 |  |
Operating income (loss) | (7) |  | (14) |  | (7) |  | (95) |  |
Interest expense, net | (51) |  | (26) |  | (90) |  | (24) |  |
Utility Plant | 0 |  | 0 |  | 0 |  | 0 |  |
Depreciation and amortization expense | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |
Income tax expense (benefit) | (123) |  | (71) |  | (203) |  | (30) |  |
Capital additions | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  |
[1] | Depreciation computed on GSWC’s transportation equipment of $218,000 and $572,000 for the three months ended June 30, 2013 and 2012, respectively, and $468,000 and $1,149,000 for the six months ended June 30, 2013 and 2012, respectively, is recorded in administrative and general expenses.

X
- 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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