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CONDENSED CONSOLIDATED STATEMENTS OF INCOME Unaudited - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement [Abstract] |  |  |  |  |  |
Operating revenue | $ 179,031 |  | $ 174,938 |  | $ 305,142 | $ 309,491
Operations: |  |  |  |  |  |
Water production costs | 64,635 |  | 65,373 |  | 110,227 | 112,979
Administrative and general | 25,434 |  | 24,383 |  | 54,531 | 50,702
Other operations | 22,542 |  | 20,724 |  | 40,363 | 38,364
Maintenance | 5,692 |  | 5,389 |  | 12,147 | 10,828
Depreciation and amortization | 22,326 |  | 20,953 |  | 44,694 | 41,668
Income taxes | 4,321 |  | 4,870 |  | 1,330 | 5,164
Property and other taxes | 7,068 |  | 6,407 |  | 14,361 | 13,111
Total operating (income) expenses | 152,018 |  | 148,099 |  | 277,653 | 272,816
Net operating income | 27,013 |  | 26,839 |  | 27,489 | 36,675
Other income and expenses: |  |  |  |  |  |
Non-regulated revenue | 5,130 |  | 4,845 |  | 10,031 | 9,264
Non-regulated expenses | (3,900) |  | (6,115) |  | (6,119) | (11,552)
Other components of net periodic benefit cost | (1,192) |  | (2,463) |  | (2,451) | (5,009)
Allowance for equity funds used during construction | 1,686 |  | 710 |  | 3,219 | 1,621
Income tax (expense) benefit on other income and expenses | (487) |  | 819 |  | (1,315) | 1,577
Net other income (loss) | 1,237 |  | (2,204) |  | 3,365 | (4,099)
Interest expense: |  |  |  |  |  |
Interest expense | 12,178 |  | 10,134 |  | 23,253 | 19,332
Allowance for borrowed funds used during construction | (924) |  | (304) |  | (1,755) | (799)
Net interest expense | 11,254 |  | 9,830 |  | 21,498 | 18,533
Net income (loss) | $ 16,996 | $ (7,640) | $ 14,805 | $ (762) | $ 9,356 | $ 14,043
Earnings per share: |  |  |  |  |  |
Basic (in dollars per share) | $ 0.35 |  | $ 0.31 |  | $ 0.19 | $ 0.29
Diluted (in dollars per share) | $ 0.35 |  | $ 0.31 |  | $ 0.19 | $ 0.29
Weighted average shares outstanding: |  |  |  |  |  |
Basic (in shares) | 48,136 |  | 48,073 |  | 48,111 | 48,051
Diluted (in shares) | 48,136 |  | 48,073 |  | 48,111 | 48,051

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