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Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income per Common Share | The following table reconciles the weighted-average shares outstanding used for these computations.
﻿ | Three Months Ended June 30, |  | Six Months Ended June 30,
(Weighted-average shares) | 2019 |  | 2018 |  | 2019 |  | 2018
Basic method | 168,537,896 |  |  | 173,042,626 |  |  | 170,555,685 |  |  | 172,907,537 |
Dilutive stock options and restricted stock units | 734,567 |  |  | 939,994 |  |  | 877,007 |  |  | 2,019,525 |
Diluted method | 169,272,463 |  |  | 173,982,620 |  |  | 171,432,692 |  |  | 174,927,062 |
Anti Dilutive Securities Not Included in Computation of Diluted EPS | The following table reflects certain options to purchase shares of common stock that were outstanding during the periods presented but were not included in the computation of diluted shares above because the incremental shares from the assumed conversion were antidilutive.
﻿ | Three Months Ended June 30, |  | Six Months Ended June 30,
﻿ | 2019 |  | 2018 |  | 2019 |  | 2018
Antidilutive stock options excluded from diluted shares | 2,927,469 |  |  | 3,396,951 |  |  | 3,066,166 |  |  | 3,622,106 |
Weighted average price of these options | $ | 45.38 |  |  | $ | 50.22 |  |  | $ | 45.66 |  |  | $ | 50.56 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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