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Stock-Based Compensation and Other Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2013
Share-based Compensation [Abstract] |
Summary Of Restricted Share Award Activity | Following is a summary of restricted share award activity during the periods indicated:
| Restricted Shares |  | Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2011 | 716,780 |  |  | $ | 14.45 |
Granted | 139,353 |  |  | 18.55 |
Vested | (12,892 | ) |  | 14.60 |
Canceled/forfeited | (9,000 | ) |  | 15.08 |
Non-vested restricted shares, as of March 31, 2012 | 834,241 |  |  | $ | 15.12 |
Non-vested restricted shares, as of December 31, 2012 | 792,396 |  |  | $ | 19.07 |
Granted | 21,267 |  |  | 27.10 |
Vested | (23,767 | ) |  | 20.35 |
Canceled/forfeited | — |  |  | — |
Non-vested restricted shares, as of March 31, 2013 | 789,896 |  |  | $ | 19.24 |
Summary of Stock Option Activity | The following is a summary of stock option activity during the periods indicated:
| Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (1) (in millions)
Options outstanding as of December 31, 2011 | 1,445,774 |  |  | $ | 10.25 |  |  | 3.16 |  | $ | 10.3 |
Exercised | (20,000 | ) |  | 5.37 |  |  |  |  |
Canceled/forfeited | — |  |  | — |  |  |  |  |
Options outstanding as of March 31, 2012 | 1,425,774 |  |  | $ | 10.32 |  |  | 2.97 |  | $ | 11.1 |
Options exercisable as of March 31, 2012 | 1,425,774 |  |  | $ | 10.32 |  |  | 2.97 |  | $ | 11.1 |
Options outstanding as of December 31, 2012 | 1,053,825 |  |  | $ | 10.55 |  |  | 2.31 |  | $ | 15.2 |
Exercised | (194,200 | ) |  | 10.02 |  |  |  |  |
Canceled/forfeited | — |  |  | — |  |  |  |  |
Options outstanding as of March 31, 2013 | 859,625 |  |  | $ | 10.66 |  |  | 2.06 |  | $ | 15.9 |
Options exercisable as of March 31, 2013 | 859,625 |  |  | $ | 10.66 |  |  | 2.06 |  | $ | 15.9 |
(1) | Amount represents the difference between the exercise price and the market price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.
Summary Of Stock-Based Compensation Expense And Related Tax Benefits | Details of stock based compensation expense and related tax benefit (expense) for the periods indicated are as follows (in millions):
| For the Three Months Ended March 31,
| 2013 |  | 2012
Stock based compensation expense: |  |  |
Restricted share awards and other | $ | 2.4 |  |  | $ | 1.0 |
Stock options | — |  |  | — |
Total stock based compensation expense | $ | 2.4 |  |  | $ | 1.0 |
Income tax benefit (expense) from stock based compensation: |  |  |
Restricted share awards and other | $ | 0.7 |  |  | $ | 0.4 |
Stock options | 0.8 |  |  | 0.1 |
Total income tax benefit (expense) from stock based compensation | $ | 1.5 |  |  | $ | 0.5 |
Excess tax benefit from stock based compensation: |  |  |
Vested restricted shares and other (1) | $ | 0.1 |  |  | $ | — |
Stock options exercised (1) | 0.8 |  |  | 0.1 |
Total excess tax benefit from stock based compensation (1) | $ | 0.9 |  |  | $ | 0.1 |
(1) | Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -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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- Definition Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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