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Stock-Based Compensation and Other Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Share-based Compensation [Abstract] |
Summary Of Restricted Share Award Activity |
Activity, restricted share awards: | Restricted Shares |  | Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2011 | 715,030 |  |  | $ | 14.44 |
Granted | 435,005 |  |  | 21.46 |
Vested | (347,889 | ) |  | 12.68 |
Canceled/forfeited | (19,865 | ) |  | 15.52 |
Non-vested restricted shares, as of December 31, 2012 | 782,281 |  |  | $ | 19.10 |
Granted | 431,346 |  |  | 31.04 |
Vested | (68,122 | ) |  | 18.83 |
Canceled/forfeited | (34,960 | ) |  | 15.58 |
Non-vested restricted shares, as of December 31, 2013 | 1,110,545 |  |  | $ | 23.86 |
Summary of Stock Option Activity |
Activity, stock options: | Stock Options |  | Per Share Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value (a) (in millions)
Options outstanding as of December 31, 2011 | 1,440,774 |  |  | $ | 10.24 |  |  | 3.21 |  | $ | 10.3 |
Exercised | (391,949 | ) |  | 9.46 |  |  |  |  |
Canceled/forfeited | (5,000 | ) |  | 14.97 |  |  |  |  |
Options outstanding as of December 31, 2012 | 1,043,825 |  |  | $ | 10.50 |  |  | 2.33 |  | $ | 15.1 |
Options exercisable as of December 31, 2012 | 1,043,825 |  |  | $ | 10.50 |  |  | 2.33 |  | $ | 15.1 |
Options outstanding as of December 31, 2012 | 1,043,825 |  |  | $ | 10.50 |  |  | 2.33 |  | $ | 15.1 |
Exercised | (513,254 | ) |  | 10.04 |  |  |  |  |
Canceled/forfeited | (35,000 | ) |  | 7.74 |  |  |  |  |
Options outstanding as of December 31, 2013 | 495,571 |  |  | $ | 11.17 |  |  | 1.96 |  | $ | 10.7 |
Options exercisable as of December 31, 2013 | 495,571 |  |  | $ | 11.17 |  |  | 1.96 |  | $ | 10.7 |
(a) 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 Employee Stock Purchase Plan Activity |
| Years Ended December 31,
Activity, employee stock purchase plan: | 2013 |  | 2012 |  | 2011
Cash proceeds (in millions) | $ | 6.4 |  |  | $ | 1.3 |  |  | $ | 0.4 |
Number of common shares | 454,523 |  |  | 90,614 |  |  | 29,162 |
Weighted average price per share | $ | 14.19 |  |  | $ | 14.37 |  |  | $ | 14.85 |
Weighted average grant date fair value per share | $ | 5.60 |  |  | $ | 4.19 |  |  | $ | 3.61 |
Summary Of Stock-Based Compensation Expense And Tax Benefits | Details of stock-based compensation expense and related tax benefits for the periods indicated are as follows (in millions):
| Years Ended December 31,
| 2013 |  | 2012 |  | 2011
Stock-based compensation expense | $ | 12.9 |  |  | $ | 4.4 |  |  | $ | 3.6 |
Income tax benefit from stock-based compensation | $ | 9.7 |  |  | $ | 2.5 |  |  | $ | 6.3 |
Excess tax benefit from stock-based compensation (a) | $ | 4.3 |  |  | $ | 0.8 |  |  | $ | 7.8 |
(a) 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 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 Tabular disclosure of employee stock purchase plan activity. + 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 (g) -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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