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Earnings per Common Share - Schedule of EPS (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Weighted-average shares - basic 451,055 464,768 455,361 465,057
Dilution effect of stock appreciation rights and stock awards at end of period 2,059 1,977 1,781 1,695
Weighted-average shares - diluted 453,114 466,745 457,142 466,752