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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Summary of Table Reconciling Basic and Diluted Net Income Per Share | The following table reconciles basic and diluted net income per share.
(dollars and shares in thousands, except per share data) | Years Ended December 31,
2020 |  | 2019 |  | 2018
Basic Net Income Per Share |  |  |  |  |
Net income | $ | 226,409 |  |  | $ | 238,206 |  |  | $ | 190,830 |
Weighted average common shares outstanding | 165,509 |  |  | 171,907 |  |  | 155,675 |
Basic Net Income Per Share | $ | 1.37 |  |  | $ | 1.39 |  |  | $ | 1.23 |
Diluted Net Income Per Share |  |  |  |  |
Net income | $ | 226,409 |  |  | $ | 238,206 |  |  | $ | 190,830 |
Weighted average common shares outstanding | 165,509 |  |  | 171,907 |  |  | 155,675 |
Effect of dilutive securities: |  |  |  |  |
Restricted stock | 632 |  |  | 733 |  |  | 796 |
Stock options and appreciation rights | 36 |  |  | 47 |  |  | 68 |
Weighted average shares outstanding | 166,177 |  |  | 172,687 |  |  | 156,539 |
Diluted Net Income Per Share | $ | 1.36 |  |  | $ | 1.38 |  |  | $ | 1.22 |

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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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