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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Components of Calculation of Earnings Per Share | The components of the calculation of earnings per share were as follows:
| 2015 |  | 2014 |  | 2013
| (Dollars and shares in thousands)
Net income | $ | 172,413 |  |  | $ | 182,391 |  |  | $ | 185,413 |
Weighted average number of shares used in: |  |  |  |  |
Basic earnings per share | 61,021 |  |  | 63,426 |  |  | 64,254 |
Dilutive common stock equivalents: |  |  |  |  |
Restricted stock units | 285 |  |  | 319 |  |  | 404 |
Diluted earnings per share | 61,306 |  |  | 63,745 |  |  | 64,658 |

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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/2003/role/presentationRef -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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