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Earnings per Common Share - Schedule of EPS (Details) - shares shares in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Earnings Per Share [Abstract] |  |  |  |
Weighted-average shares - basic | 462,498 | 465,149 | 464,194 | 454,060
Dilution effect of stock appreciation rights and stock awards at end of period | 2,282 | 0 | 1,816 | 0
Weighted-average shares - diluted | 464,780 | 465,149 | 466,010 | 454,060

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