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Performance Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2013
Performance Incentive Plan [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | The following summarizes the restricted stock activity for the year ended December 31, 2013:
| Number of Shares |  | Weighted Average Share Price
Non-vested restricted shares, January 1 | 964,612 |  |  | $ | 23.40 |
Restricted shares granted | 298,896 |  |  | 33.73 |
Restricted shares vested | (446,607 | ) |  | 21.41 |
Restricted shares forfeited | (241 | ) |  | 30.68 |
Restricted shares repurchased | (8,474 | ) |  | 24.36 |
Non-vested restricted shares, December 31 | 808,186 |  |  | $ | 28.18 |
Schedule of Other Share-based Compensation, Activity | The following summarizes other grants made during the year ended December 31, 2013, pursuant to the 2007 Plan.
| Shares |  | Weighted Average Share Price
Other share grants under the 2007 Plan: |  |  |
Directors’ fees | 16,605 |  |  | $ | 35.08 |
Deferred directors’ fees | 12,308 |  |  | 35.09 |
| 28,913 |  |  | $ | 35.08 |
Shares available under the 2007 Plan for grant, end of period | 3,958,300 |  |  |

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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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