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Business Segments: (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Details of reportable segment |  |  |
Total operating revenues | $ 98,810 | $ 93,527 |
Operating income (loss) | 24,738 | 21,233 |
Interest expense, net | 5,646 | 5,451 |
Utility plant | 1,137,159 | 1,079,318 | $ 1,150,926
Depreciation and amortization expense | 9,683 | 9,791 |
Income tax expense (benefit) | 6,855 | 5,813 |
Capital additions | $ 23,994 | 29,454 |
GSWC |  |  |
Details of reportable segment |  |  |
Number of reportable segments | segment | 2 |  |
Total operating revenues | $ 76,906 | 76,885 |
Operating income (loss) | 22,077 | 19,643 |
Utility plant | 1,131,528 |  | $ 1,145,311
Depreciation and amortization expense | 9,438 | 9,530 |
Income tax expense (benefit) | 6,273 | 5,440 |
Depreciation on transportation equipment | $ 61 | 175 |
AWR |  |  |
Details of reportable segment |  |  |
Number of reportable segments | segment | 3 |  |
Total operating revenues | $ 0 | 0 |
Operating income (loss) | (4) | (2) |
Interest expense, net | 52 | 44 |
Utility plant | 0 | 0 |
Depreciation and amortization expense | 0 | 0 |
Income tax expense (benefit) | (279) | (200) |
Capital additions | 0 | 0 |
Reportable Legal Entities [Member] | GSWC | Water |  |  |
Details of reportable segment |  |  |
Total operating revenues | 66,404 | 66,312 |
Operating income (loss) | 19,264 | 17,408 |
Interest expense, net | 5,145 | 5,075 |
Utility plant | 1,075,513 | 1,022,525 |
Depreciation and amortization expense | 8,901 | 9,023 |
Income tax expense (benefit) | 5,485 | 4,586 |
Capital additions | 22,984 | 28,141 |
Reportable Legal Entities [Member] | GSWC | Electric |  |  |
Details of reportable segment |  |  |
Total operating revenues | 10,502 | 10,573 |
Operating income (loss) | 2,813 | 2,235 |
Interest expense, net | 375 | 325 |
Utility plant | 56,015 | 51,873 |
Depreciation and amortization expense | 537 | 507 |
Income tax expense (benefit) | 788 | 854 |
Capital additions | 723 | 820 |
Reportable Legal Entities [Member] | ASUS | Contracts |  |  |
Details of reportable segment |  |  |
Total operating revenues | 21,904 | 16,642 |
Operating income (loss) | 2,665 | 1,592 |
Interest expense, net | 74 | 7 |
Utility plant | 5,631 | 4,920 |
Depreciation and amortization expense | 245 | 261 |
Income tax expense (benefit) | 861 | 573 |
Capital additions | $ 287 | $ 493 |

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