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Earnings per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings per Share [Abstract] |
Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income per Common Share |
﻿ |  |  |
﻿ |  |  |
﻿ | Three Months Ended
﻿ | March 31,
﻿(Weighted-average shares) | 2018 |  | 2017
﻿Basic method | 172,805,065 |  | 172,422,449
﻿Dilutive stock options and restricted stock units | 1,814,459 |  | 666,242
﻿ Diluted method | 174,619,524 |  | 173,088,691
﻿
Anti Dilutive Securities Not Included in Computation of Diluted EPS |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | Three Months Ended
﻿ |  | March 31,
﻿ |  | 2018 |  | 2017
﻿Antidilutive stock options excluded from diluted shares |  | 3,798,792 |  |  | 5,029,752
﻿Weighted average price of these options | $ | 50.77 |  | $ | 52.26
﻿

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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