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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Computation of Basic and Diluted Income Per Common Share | The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars in thousands, except per share data).
| Year Ended December 31
| 2013 |  | 2012 |  | 2011
Numerator: |  |  |  |  |
Net income | $ | 436,283 |  |  | $ | 163,820 |  |  | $ | 158,027 |
Denominator: |  |  |  |  |  |  |  |
Weighted average basic common shares outstanding | 96,579 |  |  | 96,384 |  |  | 99,281 |
Effect of dilutive securities: |  |  |  |  |
Stock options, unvested restricted stock, and performance units | 968 |  |  | 1,113 |  |  | 1,095 |
Diluted common shares outstanding | 97,547 |  |  | 97,497 |  |  | 100,376 |
Basic income per common share | $ | 4.52 |  |  | $ | 1.70 |  |  | $ | 1.59 |
Diluted income per common share | $ | 4.47 |  |  | $ | 1.68 |  |  | $ | 1.57 |

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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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Namespace Prefix: | us-gaap_
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