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Quarterly financial information (Unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating revenues $ 1,209,875 $ 1,280,787 $ 1,064,597 $ 976,293 $ 1,165,239 $ 1,272,548 $ 1,067,639 $ 937,925 $ 4,531,552 $ 4,443,351 $ 4,128,828
Operating expenses 1,091,524 1,140,783 990,605 906,917 1,040,957 1,117,228 988,979 872,139 4,129,829 4,019,303 3,719,919
Operating income 118,351 140,004 73,992 69,376 124,282 155,320 78,660 65,786 401,723 424,048 408,909
Income from continuing operations 75,982 107,369 44,075 41,960 115,394 89,549 44,405 35,638 $ 269,386 $ 284,986 $ 233,096
Income (loss) from discontinued operations, net of tax 2,846 (118) (273) 477 (82) (2,198) (3,190) 1,687      
Net income $ 78,828 $ 107,251 $ 43,802 $ 42,437 $ 115,312 $ 87,351 $ 41,215 $ 37,325      
Earnings per common share - basic:                      
Earnings before discontinued operations $ 0.39 $ 0.55 $ 0.22 $ 0.22 $ 0.59 $ 0.46 $ 0.22 $ 0.18 $ 1.38 $ 1.46 $ 1.19
Discontinued operations, net of tax 0.01 0 0 0 0 (0.01) (0.01) 0.01 0.01 (0.02) (0.86)
Earnings per common share - basic $ 0.40 $ 0.55 $ 0.22 $ 0.22 $ 0.59 $ 0.45 $ 0.21 $ 0.19 $ 1.39 $ 1.44 $ 0.33
Weighted average common shares outstanding - basic 196,023 196,018 195,524 195,304 195,304 195,304 195,304 195,304 195,720 195,304 195,299
Earnings per common share - diluted:                      
Earnings before discontinued operations $ 0.39 $ 0.55 $ 0.22 $ 0.22 $ 0.59 $ 0.46 $ 0.22 $ 0.18 $ 1.38 $ 1.45 $ 1.19
Discontinued operations, net of tax 0.01 0 0 0 0 (0.01) (0.01) 0.01 0.01 (0.02) (0.86)
Earnings per common share - diluted $ 0.40 $ 0.55 $ 0.22 $ 0.22 $ 0.59 $ 0.45 $ 0.21 $ 0.19 $ 1.39 $ 1.43 $ 0.33
Weighted average common shares outstanding - diluted 196,385 196,265 196,169 195,982 195,617 195,783 195,973 196,023 196,150 195,687 195,618
Additional information [Abstract]                      
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability         $ (39,500)       $ (42) $ 7,735 $ 0