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Business Segments: (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Details of reportable segment |  |  |  |  |
Total operating revenues | $ 123,806 | $ 132,975 | $ 329,287 | $ 348,526 |
Operating income (loss) | 39,617 | 41,185 | 92,624 | 96,605 |
Interest expense, net | 5,524 | 5,366 | 16,388 | 15,907 |
Utility plant | 1,128,588 | 1,032,119 | 1,128,588 | 1,032,119 | $ 1,060,794
Depreciation and amortization expense | 9,486 | 10,512 | 28,878 | 31,596 |
Income tax expense (benefit) | 12,708 | 14,394 | 28,577 | 31,826 |
Capital additions | 34,573 | 25,641 | $ 99,907 | 59,848 |
GSWC |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 2 |  |
Total operating revenues | 98,763 | 105,219 | $ 264,407 | 283,162 |
Operating income (loss) | 34,142 | 34,081 | 81,342 | 83,789 |
Utility plant | 1,122,928 |  | 1,122,928 |  | $ 1,056,116
Depreciation and amortization expense | 9,240 | 10,241 | 28,117 | 30,717 |
Income tax expense (benefit) | 11,041 | 12,109 | $ 25,203 | 28,156 |
AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Reportable Legal Entities | GSWC | Water |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 90,617 | 97,273 | $ 237,987 | 256,358 |
Operating income (loss) | 32,642 | 33,178 | 76,502 | 79,391 |
Interest expense, net | 5,145 | 5,117 | 15,272 | 15,026 |
Utility plant | 1,068,048 | 977,549 | 1,068,048 | 977,549 |
Depreciation and amortization expense | 8,734 | 9,773 | 26,597 | 29,482 |
Income tax expense (benefit) | 10,575 | 11,819 | 23,528 | 26,550 |
Capital additions | 32,655 | 22,608 | 93,189 | 52,770 |
Reportable Legal Entities | GSWC | Electric |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 8,146 | 7,946 | 26,420 | 26,804 |
Operating income (loss) | 1,500 | 903 | 4,840 | 4,398 |
Interest expense, net | 328 | 267 | 997 | 891 |
Utility plant | 54,880 | 50,294 | 54,880 | 50,294 |
Depreciation and amortization expense | 506 | 468 | 1,520 | 1,235 |
Income tax expense (benefit) | 466 | 290 | 1,675 | 1,606 |
Capital additions | 1,290 | 2,881 | 4,972 | 6,560 |
Reportable Legal Entities | ASUS | Contracts |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 25,043 | 27,756 | 64,880 | 65,364 |
Operating income (loss) | 5,487 | 7,108 | 11,298 | 12,825 |
Interest expense, net | 12 | 7 | 29 | 23 |
Utility plant | 5,660 | 4,276 | 5,660 | 4,276 |
Depreciation and amortization expense | 246 | 271 | 761 | 879 |
Income tax expense (benefit) | 1,951 | 2,590 | 4,029 | 4,349 |
Capital additions | 628 | 152 | 1,746 | 518 |
Intersegment Eliminations | AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | (12) | (4) | (16) | (9) |
Interest expense, net | 39 | (25) | 90 | (33) |
Utility plant | 0 | 0 | 0 | 0 |
Depreciation and amortization expense | 0 | 0 | 0 | 0 |
Income tax expense (benefit) | (284) | (305) | (655) | (679) |
Capital additions | $ 0 | $ 0 | $ 0 | $ 0 |

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