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Per Common Share Information | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Per Common Share Information | Per Common Share InformationDiluted earnings per common share is calculated using net income divided by diluted weighted-average shares. Diluted weighted-average shares include weighted-average shares outstanding plus the dilutive effect of share-based compensation, calculated using the treasury stock method, of 7.1 million shares and 7.6 million shares for the quarters 2018 and 2017, respectively, and 7.6 million shares and 7.1 million shares for the six months 2018 and 2017, respectively. Stock options that would have been antidilutive, and therefore were not included in the calculation of diluted weighted-average shares, totaled 2.6 million shares and 0.1 million shares for the quarters 2018 and 2017, respectively, and 2.6 million shares and 4.0 million shares for the six months 2018 and 2017, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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