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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
OPERATING REVENUES |  |  |  |  |
Utility |  | $ 301,420 | $ 317,064 | $ 501,385 | $ 526,851
Nonutility |  | 564,835 | 701,979 | 1,176,637 | 1,197,497
Total operating revenues |  | 866,255 | 1,019,043 | 1,678,022 | 1,724,348
Gas purchases: |  |  |  |  |
Gas purchases - Utility |  | 138,117 | 96,586 | 225,766 | 174,188
Gas purchases - Nonutility |  | 545,268 | 621,223 | 1,080,651 | 1,066,307
Gas purchases - Related parties |  | 2,144 | 2,087 | 4,329 | 4,236
Operation and maintenance |  | 62,959 | 56,797 | 123,061 | 110,957
Regulatory rider expenses |  | 15,391 | 19,604 | 28,023 | 31,373
Depreciation and amortization |  | 22,311 | 22,460 | 44,143 | 44,314
Energy and other taxes |  | 3,064 | 21,542 | 6,305 | 38,033
Total operating expenses |  | 789,254 | 840,299 | 1,512,278 | 1,469,408
OPERATING INCOME |  | 77,001 | 178,744 | 165,744 | 254,940
Other income, net |  | 2,758 | 1,028 | 3,627 | 7,004
Interest expense, net of capitalized interest |  | 12,509 | 11,798 | 25,995 | 23,703
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES |  | 67,250 | 167,974 | 143,376 | 238,241
Income tax (benefit) provision |  | (2,952) | 30,901 | (9,913) | (19,267)
Equity in earnings of affiliates |  | 3,371 | 3,193 | 6,532 | 6,457
NET INCOME | [1] | $ 73,573 | $ 140,266 | $ 159,821 | $ 263,965
EARNINGS PER COMMON SHARE |  |  |  |  |
Basic (usd per share) |  | $ 0.83 | $ 1.60 | $ 1.80 | $ 3.02
Diluted (usd per share) | [2] | $ 0.82 | $ 1.59 | $ 1.79 | $ 3.01
WEIGHTED AVERAGE SHARES OUTSTANDING |  |  |  |  |
Basic (in shares) |  | 88,836 | 87,595 | 88,692 | 87,295
Diluted (in shares) |  | 89,228 | 87,989 | 89,093 | 87,690
[1] | Includes income tax benefit related to the Tax Act of $967,000 and $58.5 million, for the three and six months ended March 31, 2018, respectively.
[2] | There were no anti-dilutive shares excluded from the calculation of diluted earnings per share during fiscal 2019 and 2018.

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