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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Components of Calculation of Earnings Per Share | The components of the calculation of earnings per share are as follows:
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (Dollars and shares in thousands) |
Net income |  | $ | 151,346 |  |  | $ | 193,173 |  |  | $ | 144,646 |
Weighted average number of shares used in: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  |  | 69,571 |  |  |  | 69,996 |  |  |  | 75,905 |
Dilutive common stock equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units |  |  | 318 |  |  |  | 386 |  |  |  | 603 |
Diluted earnings per share |  |  | 69,889 |  |  |  | 70,382 |  |  |  | 76,508 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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