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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings per Share [Abstract] |
Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income per Common Share |
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﻿(Weighted-average shares) |  | 2017 |  | 2016 |  | 2015
﻿Basic method |  | 172,524,061 |  | 172,173,012 |  | 174,351,227
﻿Dilutive stock options 1 |  | – |  | – |  | –
﻿ Diluted method |  | 172,524,061 |  | 172,173,012 |  | 174,351,227
﻿ 1 Due to a net loss recognized by the Company for the years ended December 31, 2017, 2016 and 2015, no unvested stock awards were included in the computation of diluted earnings per share because the effect would have been antidilutive.
Anti Dilutive Securities Not Included in Computation of Diluted EPS |
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﻿ |  | 2017 |  | 2016 |  | 2015
﻿Antidilutive stock options excluded from diluted shares |  | 4,901,269 |  | 5,757,435 |  | 5,443,288
﻿Weighted average price of these options |  | $45.74 |  | $48.46 |  | $52.93
﻿

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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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