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Earnings per common share (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Weighted average common shares outstanding | A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculations follows:
| Three Months Ended |  | Six Months Ended |
| June 30, |  | June 30, |
| 2020 | 2019 | 2020 | 2019
| (In thousands, except per share amounts) |  |  |
Weighted average common shares outstanding - basic | 200,522 |  | 198,270 |  | 200,481 |  | 197,341 |
Effect of dilutive performance share awards and restricted stock units | 17 |  | 17 |  | 16 |  | 15 |
Weighted average common shares outstanding - diluted | 200,539 |  | 198,287 |  | 200,497 |  | 197,356 |
Shares excluded from the calculation of diluted earnings per share | 187 |  | — |  | 191 |  | 93 |
Dividends declared per common share | $ | .2075 |  | $ | .2025 |  | $ | .4150 |  | $ | .4050 |

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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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