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Business Segments: (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) segment | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Details of reportable segment |  |  |
Total operating revenues | $ 93,527 | $ 100,933 |
Operating income (loss) | 21,233 | 24,890 |
Interest expense, net | 5,451 | 5,116 |
Utility plant | 1,079,318 | 1,007,563 | $ 1,060,794
Depreciation and amortization expense | 9,791 | 10,548 |
Income tax expense (benefit) | 5,813 | 7,898 |
Capital additions | $ 29,454 | 17,390 |
GSWC |  |  |
Details of reportable segment |  |  |
Number of reportable segments | segment | 2 |  |
Total operating revenues | $ 76,885 | 82,473 |
Operating income (loss) | 19,643 | 22,473 |
Utility plant | 1,074,398 |  | $ 1,056,116
Depreciation and amortization expense | 9,530 | 10,241 |
Income tax expense (benefit) | 5,440 | 7,247 |
Depreciation on transportation equipment | $ 175 | 223 |
AWR |  |  |
Details of reportable segment |  |  |
Number of reportable segments | segment | 3 |  |
Total operating revenues | $ 0 | 0 |
Operating income (loss) | (2) | (3) |
Interest expense, net | 44 | (6) |
Utility plant | 0 | 0 |
Depreciation and amortization expense | 0 | 0 |
Income tax expense (benefit) | (200) | (220) |
Capital additions | 0 | 0 |
Reportable Legal Entities [Member] | GSWC | Water |  |  |
Details of reportable segment |  |  |
Total operating revenues | 66,312 | 71,504 |
Operating income (loss) | 17,408 | 19,741 |
Interest expense, net | 5,075 | 4,801 |
Utility plant | 1,022,525 | 958,270 |
Depreciation and amortization expense | 9,023 | 9,941 |
Income tax expense (benefit) | 4,586 | 6,144 |
Capital additions | 28,141 | 16,244 |
Reportable Legal Entities [Member] | GSWC | Electric |  |  |
Details of reportable segment |  |  |
Total operating revenues | 10,573 | 10,969 |
Operating income (loss) | 2,235 | 2,732 |
Interest expense, net | 325 | 313 |
Utility plant | 51,873 | 44,871 |
Depreciation and amortization expense | 507 | 300 |
Income tax expense (benefit) | 854 | 1,103 |
Capital additions | 820 | 1,074 |
Reportable Legal Entities [Member] | ASUS | Contracts |  |  |
Details of reportable segment |  |  |
Total operating revenues | 16,642 | 18,460 |
Operating income (loss) | 1,592 | 2,420 |
Interest expense, net | 7 | 8 |
Utility plant | 4,920 | 4,422 |
Depreciation and amortization expense | 261 | 307 |
Income tax expense (benefit) | 573 | 871 |
Capital additions | $ 493 | $ 72 |

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