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Earnings per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Calculation of basic and diluted weighted-average shares outstanding | The following is a calculation of basic and diluted weighted-average shares outstanding:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
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 |
Calculation of weighted-average shares excluded from diluted EPS due to the anti-dilutive effect | The following is a calculation of weighted-average shares excluded from diluted EPS due to the anti-dilutive effect:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Weighted-average stock appreciation rights and stock awards excluded from diluted EPS due to the anti-dilutive effect calculated using the treasury stock method |  | — |  |  | — |  |  | 956 |  |  | 774 |

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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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