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Business Segments: (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) segment | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Details of reportable segment |  |  |  |  |
Total operating revenues | $ 114,618 | $ 115,641 | $ 215,551 | $ 217,586 |
Operating income (loss) | 30,530 | 31,000 | 55,420 | 53,768 |
Interest expense, net | 5,425 | 5,655 | 10,541 | 11,170 |
Utility plant | 1,015,507 | 988,668 | 1,015,507 | 988,668 | $ 1,003,520
Depreciation and amortization expense | 10,536 | 10,525 | 21,084 | 21,055 |
Income tax expense (benefit) | 9,534 | 10,262 | 17,432 | 16,619 |
Capital additions | 16,817 | 15,089 | $ 34,207 | 35,620 |
GSWC |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 2 |  |
Total operating revenues | 95,470 | 94,560 | $ 177,943 | 175,773 |
Operating income (loss) | 27,235 | 28,575 | 49,708 | 49,005 |
Utility plant | 1,011,108 |  | 1,011,108 |  | $ 998,880
Depreciation and amortization expense | 10,235 | 10,232 | 20,476 | 20,472 |
Income tax expense (benefit) | 8,800 | 9,783 | 16,047 | 15,488 |
Depreciation on transportation equipment | 151 | 225 | $ 374 | 497 |
AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Reportable Legal Entities [Member] | GSWC | Water |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 87,581 | 86,232 | $ 159,085 | 156,989 |
Operating income (loss) | 26,472 | 27,182 | 46,213 | 45,577 |
Interest expense, net | 5,108 | 5,271 | 9,909 | 10,439 |
Utility plant | 963,147 | 943,382 | 963,147 | 943,382 |
Depreciation and amortization expense | 9,768 | 9,634 | 19,709 | 19,197 |
Income tax expense (benefit) | 8,587 | 9,374 | 14,731 | 14,332 |
Capital additions | 13,918 | 14,327 | 30,162 | 33,651 |
Reportable Legal Entities [Member] | GSWC | Electric |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 7,889 | 8,328 | 18,858 | 18,784 |
Operating income (loss) | 763 | 1,393 | 3,495 | 3,428 |
Interest expense, net | 311 | 337 | 624 | 671 |
Utility plant | 47,961 | 40,304 | 47,961 | 40,304 |
Depreciation and amortization expense | 467 | 598 | 767 | 1,275 |
Income tax expense (benefit) | 213 | 409 | 1,316 | 1,156 |
Capital additions | 2,605 | 208 | 3,679 | 680 |
Reportable Legal Entities [Member] | ASUS | Contracts |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 19,148 | 21,081 | 37,608 | 41,813 |
Operating income (loss) | 3,297 | 2,425 | 5,717 | 4,809 |
Interest expense, net | 8 | 55 | 16 | 122 |
Utility plant | 4,399 | 4,982 | 4,399 | 4,982 |
Depreciation and amortization expense | 301 | 293 | 608 | 583 |
Income tax expense (benefit) | 888 | 923 | 1,759 | 1,746 |
Capital additions | 294 | 554 | 366 | 1,289 |
Intersegment Eliminations | AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | (2) | 0 | (5) | (46) |
Interest expense, net | (2) | (8) | (8) | (62) |
Utility plant | 0 | 0 | 0 | 0 |
Depreciation and amortization expense | 0 | 0 | 0 | 0 |
Income tax expense (benefit) | (154) | (444) | (374) | (615) |
Capital additions | $ 0 | $ 0 | $ 0 | $ 0 |

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