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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Components of Calculation of Earnings Per Share | The components of the calculation of earnings per share were as follows:
| 2020 |  | 2019 |  | 2018
| (Dollars and shares in thousands)
Net income | $ | 308,722 |  |  | $ | 193,814 |  |  | $ | 223,994 |
Weighted average number of shares used in: |  |  |  |  |
Basic earnings per share | 110,768 |  |  | 110,939 |  |  | 110,603 |
Dilutive common stock equivalents: |  |  |  |  |
Restricted stock units | 625 |  |  | 569 |  |  | 1,029 |
Diluted earnings per share | 111,393 |  |  | 111,508 |  |  | 111,632 |

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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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