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v3.10.0.1

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating revenues: |  |  |
Operating revenues | $ 4,531,552 | $ 4,443,351 | $ 4,128,828
Operating expenses: |  |  |
Operation and maintenance: | 3,256,121 | 3,135,466 | 2,893,510
Purchased natural gas sold | 404,153 | 430,954 | 382,753
Depreciation, depletion and amortization | 220,205 | 207,486 | 216,318
Taxes, other than income | 168,638 | 166,673 | 151,826
Electric fuel and purchased power | 80,712 | 78,724 | 75,512
Total operating expenses | 4,129,829 | 4,019,303 | 3,719,919
Operating income | 401,723 | 424,048 | 408,909
Other income (expense) | (238) | 8,767 | 5,167
Interest expense | 84,614 | 82,788 | 87,848
Income before income taxes | 316,871 | 350,027 | 326,228
Income taxes | 47,485 | 65,041 | 93,132
Income from continuing operations | 269,386 | 284,986 | 233,096
Income (loss) from discontinued operations, net of tax (Note 4) | 2,932 | (3,783) | (300,354)
Net income (loss) | 272,318 | 281,203 | (67,258)
Loss from discontinued operations attributable to noncontrolling interest (Note 4) | 0 | 0 | (131,691)
Loss on redemption of preferred stocks (Note 10) | 0 | 600 | 0
Dividends declared on preferred stocks | 0 | 171 | 685
Earnings on common stock | $ 272,318 | $ 280,432 | $ 63,748
Earnings per common share - basic: |  |  |
Earnings before discontinued operations | $ 1.38 | $ 1.46 | $ 1.19
Discontinued operations attributable to the Company, net of tax | 0.01 | (0.02) | (0.86)
Earnings per common share - basic | 1.39 | 1.44 | 0.33
Earnings per common share - diluted: |  |  |
Earnings before discontinued operations | 1.38 | 1.45 | 1.19
Discontinued operations attributable to the Company, net of tax | 0.01 | (0.02) | (0.86)
Earnings per common share - diluted | $ 1.39 | $ 1.43 | $ 0.33
Weighted average common shares outstanding - basic | 195,720 | 195,304 | 195,299
Weighted average common shares outstanding - diluted | 196,150 | 195,687 | 195,618
Regulated: |  |  |
Operating revenues: |  |  |
Operating revenues | $ 1,213,227 | $ 1,244,759 | $ 1,141,454
Operating expenses: |  |  |
Operation and maintenance: | 340,331 | 326,687 | 312,211
Nonregulated: |  |  |
Operating revenues: |  |  |
Operating revenues | 3,318,325 | 3,198,592 | 2,987,374
Operating expenses: |  |  |
Operation and maintenance: | $ 2,915,790 | $ 2,808,779 | $ 2,581,299

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