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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2011
Earnings Per Share [Abstract] |
Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share |
|  | 2011 |  |  | 2010 |  |  | 2009 |
|  | Income (Numerator) |  |  | Weighted Shares (Denominator) |  |  | Per-Share Amount |  |  | Income (Numerator) |  |  | Weighted Shares (Denominator) |  |  | Per-Share Amount |  |  | Income (Numerator) |  |  | Weighted Shares (Denominator) |  |  | Per-Share Amount |
|  | (Amounts in thousands, except per share data) |
Basic EPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 191,164 |  |  |  | 54,825 |  |  | $ | 3.49 |  |  | $ | 152,198 |  |  |  | 54,792 |  |  | $ | 2.78 |  |  | $ | 403,072 |  |  |  | 54,770 |  |  | $ | 7.36 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options |  |  | 0 |  |  |  | 20 |  |  |  |  |  |  |  | 0 |  |  |  | 34 |  |  |  |  |  |  |  | 0 |  |  |  | 322 |  |  |  |  |
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders after assumed conversions |  | $ | 191,164 |  |  |  | 54,845 |  |  | $ | 3.49 |  |  | $ | 152,198 |  |  |  | 54,826 |  |  | $ | 2.78 |  |  | $ | 403,072 |  |  |  | 55,092 |  |  | $ | 7.32 |

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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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