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v3.19.3.a.u2

Quarterly financial information (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating revenues | $ 1,378,213 | $ 1,563,799 | $ 1,303,573 | $ 1,091,191 | $ 1,209,875 | $ 1,280,787 | $ 1,064,597 | $ 976,293 | $ 5,336,776 | $ 4,531,552 | $ 4,443,351
Operating expenses | 1,247,992 | 1,374,329 | 1,206,262 | 1,026,973 | 1,091,524 | 1,140,783 | 990,605 | 906,917 | 4,855,556 | 4,129,829 | 4,019,303
Operating income | 130,221 | 189,470 | 97,311 | 64,218 | 118,351 | 140,004 | 73,992 | 69,376 | 481,220 | 401,723 | 424,048
Income from continuing operations | 94,804 | 136,128 | 63,145 | 41,089 | 75,982 | 107,369 | 44,075 | 41,960 | 335,166 | 269,386 | 284,986
Income (loss) from discontinued operations, net of tax | 261 | 1,509 | (1,320) | (163) | 2,846 | (118) | (273) | 477 | 287 | 2,932 | (3,783)
Net income | $ 95,065 | $ 137,637 | $ 61,825 | $ 40,926 | $ 78,828 | $ 107,251 | $ 43,802 | $ 42,437 | $ 335,453 | $ 272,318 | $ 281,203
Earnings per common share - basic: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 0.47 | $ 0.68 | $ 0.32 | $ 0.21 | $ 0.39 | $ 0.55 | $ 0.22 | $ 0.22 | $ 1.69 | $ 1.38 | $ 1.46
Discontinued operations, net of tax | 0 | 0.01 | (0.01) | 0 | 0.01 | 0 | 0 | 0 | 0 | 0.01 | (0.02)
Earnings per share - basic | $ 0.47 | $ 0.69 | $ 0.31 | $ 0.21 | $ 0.40 | $ 0.55 | $ 0.22 | $ 0.22 | $ 1.69 | $ 1.39 | $ 1.44
Weighted average common shares outstanding - basic | 200,383 | 199,343 | 198,270 | 196,401 | 196,023 | 196,018 | 195,524 | 195,304 | 198,612 | 195,720 | 195,304
Earnings per common share - diluted: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 0.47 | $ 0.68 | $ 0.32 | $ 0.21 | $ 0.39 | $ 0.55 | $ 0.22 | $ 0.22 | $ 1.69 | $ 1.38 | $ 1.45
Discontinued operations, net of tax | 0 | 0.01 | (0.01) | 0 | 0.01 | 0 | 0 | 0 | 0 | 0.01 | (0.02)
Earnings per share - diluted | $ 0.47 | $ 0.69 | $ 0.31 | $ 0.21 | $ 0.40 | $ 0.55 | $ 0.22 | $ 0.22 | $ 1.69 | $ 1.39 | $ 1.43
Weighted average common shares outstanding - diluted | 200,478 | 199,383 | 198,287 | 196,414 | 196,385 | 196,265 | 196,169 | 195,982 | 198,626 | 196,150 | 195,687

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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration