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Business Segments: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Details of reportable segment |  |  |  |  |  |
Total operating revenues | $ 138,327 | $ 130,914 | $ 355,913 | $ 362,161 |  |
Operating income (loss) | 39,895 | 36,164 | 93,663 | 97,421 |  |
Interest expense, net | 5,295 | 5,667 | 16,465 | 16,886 |  |
Utility plant | 995,443 | 968,459 | 995,443 | 968,459 |  | 981,477
Depreciation and amortization expense | 10,549 | 9,753 | 31,604 | 29,337 | [1] |
Income tax expense (benefit) | 13,476 | 9,905 | 30,095 | 30,302 |  |
Capital additions | 18,094 | 27,870 | 53,714 | 69,059 |  |
GSWC |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Number of reportable segments |  |  | 2 |  |  |
Total operating revenues | 105,314 | 102,781 | 281,087 | 275,214 |  |
Operating income (loss) | 32,346 | 32,284 | 81,351 | 84,838 |  |
Utility plant | 990,589 |  | 990,589 |  |  | 977,294
Depreciation and amortization expense | 10,236 | 9,474 | 30,708 | 28,480 |  |
Income tax expense (benefit) | 11,019 | 10,251 | 26,507 | 27,557 |  |
Depreciation on transportation equipment | 201 | 214 | 698 | 682 |  |
AWR |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Number of reportable segments |  |  | 3 |  |  |
Reportable Legal Entities [Member] | GSWC | Water |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Total operating revenues | 96,700 | 93,932 | 253,689 | 247,234 |  |
Operating income (loss) | 31,185 | 31,022 | 76,762 | 79,557 |  |
Interest expense, net | 4,976 | 5,297 | 15,415 | 15,699 |  |
Utility plant | 950,256 | 923,521 | 950,256 | 923,521 |  |
Depreciation and amortization expense | 9,643 | 8,900 | 28,840 | 26,739 | [1] |
Income tax expense (benefit) | 10,749 | 9,812 | 25,081 | 25,574 |  |
Capital additions | 17,093 | 27,256 | 50,744 | 67,397 |  |
Reportable Legal Entities [Member] | GSWC | Electric |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Total operating revenues | 8,614 | 8,849 | 27,398 | 27,980 |  |
Operating income (loss) | 1,161 | 1,262 | 4,589 | 5,281 |  |
Interest expense, net | 319 | 370 | 990 | 1,124 |  |
Utility plant | 40,333 | 40,904 | 40,333 | 40,904 |  |
Depreciation and amortization expense | 593 | 574 | 1,868 | 1,741 | [1] |
Income tax expense (benefit) | 270 | 439 | 1,426 | 1,983 |  |
Capital additions | 726 | 546 | 1,406 | 1,426 |  |
Reportable Legal Entities [Member] | ASUS | Contracts |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Total operating revenues | 33,013 | 28,133 | 74,826 | 86,947 |  |
Operating income (loss) | 7,549 | 3,882 | 12,358 | 12,592 |  |
Interest expense, net | 10 | (71) | 132 | 224 |  |
Utility plant | 4,854 | 4,034 | 4,854 | 4,034 |  |
Depreciation and amortization expense | 313 | 279 | 896 | 857 | [1] |
Income tax expense (benefit) | 2,857 | 1,343 | 4,603 | 4,637 |  |
Capital additions | 275 | 68 | 1,564 | 236 |  |
Intersegment Eliminations | AWR |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |
Total operating revenues | 0 | 0 | 0 | 0 |  |
Operating income (loss) | 0 | (2) | (46) | (9) |  |
Interest expense, net | (10) | (71) | (72) | (161) |  |
Utility plant | 0 | 0 | 0 | 0 |  |
Depreciation and amortization expense | 0 | 0 | 0 | 0 | [1] |
Income tax expense (benefit) | (400) | (1,689) | (1,015) | (1,892) |  |
Capital additions | $ 0 | $ 0 | $ 0 |  |  |
[1] | Depreciation expense computed on GSWC’s transportation equipment of $201,000 and $214,000 for the three months ended September 30, 2014 and 2013, respectively, and $698,000 and $682,000 for the nine months ended September 30, 2014 and 2013, respectively, is recorded in administrative and general expenses.

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