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Quarterly Financial Data (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 | [1]
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 803,489 | $ 829,275 | $ 805,515 | $ 783,400 | $ 771,241 | $ 812,673 | $ 791,512 | $ 747,166 | $ 3,221,679 | $ 3,122,592 | [1] | $ 3,063,702
Operating income | 121,502 | 137,925 | 126,678 | 88,175 | 92,939 | 112,369 | 106,596 | 76,295 | 474,280 | 388,199 | [1] | (172,684)
Net income | $ 67,105 | $ 83,046 | $ 75,859 | $ 54,362 | $ 289,928 | $ 53,716 | $ 50,477 | $ 34,786 | $ 280,372 | $ 428,907 | [1] | $ (161,586)
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.30 | $ 1.60 | $ 1.46 | $ 1.05 | $ 5.60 | $ 1.04 | $ 0.98 | $ 0.67 | $ 5.40 | $ 8.28 | [1] | $ (3.14)
Diluted (in dollars per share) | $ 1.28 | $ 1.57 | $ 1.43 | $ 1.03 | $ 5.46 | $ 1.01 | $ 0.95 | $ 0.65 | $ 5.30 | $ 8.08 | [1] | $ (3.14)
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 51,650 | 52,039 | 52,046 | 51,921 | 51,811 | 51,833 | 51,751 | 51,820 | 51,914 | 51,804 | [1] | 51,505
Diluted (in shares) | 52,556 | 52,981 | 52,913 | 53,033 | 53,140 | 53,080 | 52,977 | 53,202 | 52,871 | 53,100 | [1] | 51,505
Revaluation of deferred tax liability |  |  |  |  |  |  |  |  |  | $ 246,800 |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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