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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted | The computation of per share earnings is as follows:
(In thousands, except per share data) | 2020 |  | 2019 |  | 2018
Net income available to common stockholders | $ | 254,852 |  |  | $ | 237,828 |  |  | $ | 215,713 |
Average common shares outstanding | 109,860 |  |  | 98,351 |  |  | 92,268 |
Average potential dilutive common shares | 313 |  |  | 446 |  |  | 562 |
Average diluted common shares | 110,173 |  |  | 98,797 |  |  | 92,830 |
Basic earnings per share | $ | 2.32 |  |  | $ | 2.42 |  |  | $ | 2.34 |
Diluted earnings per share | $ | 2.31 |  |  | $ | 2.41 |  |  | $ | 2.32 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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