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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The following table summarizes activity in stock options and restricted stock awards, including performance-based and market-based shares:
| Stock Options |  | Restricted Stock
| Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2012 | 1,992,700 |  |  | $ | 20.72 |  |  | 353,722 |  |  | $ | 14.03 |
Granted | — |  |  | $ | — |  |  | 249,113 |  |  | $ | 20.03 |
Exercised | (319,239 | ) |  | $ | 14.47 |  |  | (275,988 | ) |  | $ | 15.92 |
Forfeited | — |  |  | $ | — |  |  | (11,542 | ) |  | $ | 18.39 |
Expired | (329,795 | ) |  | $ | 27.17 |  |  | — |  |  | — |
Outstanding at December 31, 2013 | 1,343,666 |  |  | $ | 20.63 |  |  | 315,305 |  |  | 17.87 |
The following table provides additional information concerning stock options, and restricted stock activity including performance-based and market-based shares:
|  | Year Ended December 31,
Stock Options |  | 2013 |  | 2012 |  | 2011
Weighted-average grant date fair value of options granted |  | $ | — |  |  | $ | — |  |  | $ | — |
Total fair value of options that vested (in thousands) |  | $ | 625 |  |  | $ | 1,054 |  |  | $ | 1,189 |
Total intrinsic value of options exercised (in thousands) |  | $ | 2,721 |  |  | $ | 6,356 |  |  | $ | 2,616 |
Restricted Stock |  |  |  |  |  |
Weighted-average grant date fair value |  | $ | 20.03 |  |  | $ | 16.75 |  |  | $ | 13.79 |
Total fair value of restricted shares that vested (in thousands) |  | $ | 4,395 |  |  | $ | 5,099 |  |  | $ | 1,240 |
The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:
|  | Year Ended December 31,
Restricted Shares and Performance-Based Shares |  | 2013 |  | 2012 |  | 2011 |
Expected quarterly dividends per share |  | $ | 0.165 |  |  | $ | 0.145 |  |  | $ | 0.125 |  |
Risk-free interest rate |  | 0.34 | % |  | 1.22 | % |  | 1.35 | % |
Market-Based Shares |  |  |  |  |  |  |
Dividend yield |  | 2.86 | % |  | 3.45 | % |  | N/A |  |
Expected volatility |  | 25.11 | % |  | 43.98 | % |  | N/A |  |
Risk-free interest rate |  | 0.36 | % |  | 1.04 | % |  | N/A |  |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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