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Business Segments: (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) segment | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Details of reportable segment |  |  |  |  |
Total operating revenues | $ 111,954 | $ 114,618 | $ 205,481 | $ 215,551 |
Operating income (loss) | 31,774 | 30,530 | 53,007 | 55,420 |
Interest expense, net | 5,413 | 5,425 | 10,864 | 10,541 |
Utility plant | 1,107,137 | 1,015,507 | 1,107,137 | 1,015,507 | $ 1,060,794
Depreciation and amortization expense | 9,601 | 10,536 | 19,392 | 21,084 |
Income tax expense (benefit) | 10,056 | 9,534 | 15,869 | 17,432 |
Capital additions | 35,880 | 16,817 | $ 65,334 | 34,207 |
GSWC |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 2 |  |
Total operating revenues | 88,759 | 95,470 | $ 165,644 | 177,943 |
Operating income (loss) | 27,557 | 27,235 | 47,200 | 49,708 |
Utility plant | 1,101,861 |  | 1,101,861 |  | $ 1,056,116
Depreciation and amortization expense | 9,347 | 10,235 | 18,877 | 20,476 |
Income tax expense (benefit) | 8,722 | 8,800 | $ 14,162 | 16,047 |
AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Reportable Legal Entities | GSWC | Water |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 81,058 | 87,581 | $ 147,370 | 159,085 |
Operating income (loss) | 26,452 | 26,472 | 43,860 | 46,213 |
Interest expense, net | 5,052 | 5,108 | 10,127 | 9,909 |
Utility plant | 1,048,127 | 963,147 | 1,048,127 | 963,147 |
Depreciation and amortization expense | 8,840 | 9,768 | 17,863 | 19,709 |
Income tax expense (benefit) | 8,367 | 8,587 | 12,953 | 14,731 |
Capital additions | 32,393 | 13,918 | 60,534 | 30,162 |
Reportable Legal Entities | GSWC | Electric |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 7,701 | 7,889 | 18,274 | 18,858 |
Operating income (loss) | 1,105 | 763 | 3,340 | 3,495 |
Interest expense, net | 344 | 311 | 669 | 624 |
Utility plant | 53,734 | 47,961 | 53,734 | 47,961 |
Depreciation and amortization expense | 507 | 467 | 1,014 | 767 |
Income tax expense (benefit) | 355 | 213 | 1,209 | 1,316 |
Capital additions | 2,862 | 2,605 | 3,682 | 3,679 |
Reportable Legal Entities | ASUS | Contracts |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 23,195 | 19,148 | 39,837 | 37,608 |
Operating income (loss) | 4,219 | 3,297 | 5,811 | 5,717 |
Interest expense, net | 10 | 8 | 17 | 16 |
Utility plant | 5,276 | 4,399 | 5,276 | 4,399 |
Depreciation and amortization expense | 254 | 301 | 515 | 608 |
Income tax expense (benefit) | 1,505 | 888 | 2,078 | 1,759 |
Capital additions | 625 | 294 | 1,118 | 366 |
Intersegment Eliminations | AWR |  |  |  |  |
Details of reportable segment |  |  |  |  |
Total operating revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | (2) | (2) | (4) | (5) |
Interest expense, net | 7 | (2) | 51 | (8) |
Utility plant | 0 | 0 | 0 | 0 |
Depreciation and amortization expense | 0 | 0 | 0 | 0 |
Income tax expense (benefit) | (171) | (154) | (371) | (374) |
Capital additions | $ 0 | $ 0 | $ 0 | $ 0 |

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