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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Summary of Restricted Stock Unit Awards Activity |
|  |  |  |  |  |  |  | Aggregate
|  |  |  |  | Weighted-Average |  | Intrinsic
|  |  | Number |  | Grant Date |  | Value
|  |  | of Shares |  | Fair Value |  | (in thousands)
Granted and Unvested - January 1, 2014 |  |  | 361,668 |  | $ | 17.30 |  | $ | 9,512
Vested |  |  | (281,668) |  | $ | 16.76 |  | $ | 8,049
Granted |  |  | 996,597 |  | $ | 27.10 |  | $ | 23,988
Forfeited |  |  | (20,000) |  | $ | 24.77 |  | $ | —
Total Granted and Unvested |  |  | 1,056,597 |  | $ | 26.54 |  | $ | 25,432
Approved for grant |  |  | 749,000 |  |  | (a) |  | $ | 18,028
Total Awarded and Unvested - December 31, 2014 |  |  | 1,805,597 |  |  | n.a. |  | $ | 43,461
______________
| (a) |  | Grant date fair value cannot be determined currently because the related performance targets for future years have not yet been established by the Compensation Committee.
Vesting Schedule of Outstanding Unvested Restricted Stock Unit Awards |
|  | Number
Vesting Date |  | of Awards
2015 |  | 390,500
2016 |  | 202,500
2017 |  | 857,597
2018 |  | 196,000
2019 |  | 159,000
|  | 1,805,597
Summary of Stock Options Activity |
|  |  |  |  | Weighted-Average
|  |  | Number |  | Grant Date |  | Exercise
|  |  | of Shares |  | Fair Value |  | Price
Total Granted and Outstanding - January 1, 2014 |  |  | 1,295,000 |  | $ | 9.94 |  | $ | 20.20
Granted |  |  | 714,000 |  | $ | 17.69 |  | $ | 18.40
Exercised |  |  | (20,000) |  | $ | 7.25 |  | $ | 12.54
Forfeited |  |  | — |  |  | — |  |  | —
Total Granted and Outstanding |  |  | 1,989,000 |  | $ | 12.75 |  | $ | 19.63
Approved for grant |  |  | 636,000 |  |  | (a) |  |  | 17.62
Total Awarded and Outstanding - December 31, 2014 |  |  | 2,625,000 |  |  | n.a. |  |  | 19.14
______________
| (a) |  | Grant date fair value cannot be determined currently because the related performance targets for future years have not yet been established by the Compensation Committee.
Key Assumptions Used in Estimating Grant Date Fair Value of Stock Option Awards |
|  | Grant dates established during
|  | 2014 |  | 2013 |  | 2012
Awarded during |  | 2014 |  | 2013 |  | 2013 |  | 2012 |  | 2012 |  | 2013 | 2009 (1) | 2012 | 2009 (1)
Number of options |  | 250,000 |  |  | 75,000 |  |  | 9,000 |  |  | 150,000 |  |  | 230,000 |  |  | 50,000 |  | 150,000 |  |  | 15,000 |  |  | 150,000 |
Risk-free interest rate |  | 2.08 | % |  | 1.72 | % |  | 2.25 |  |  | 1.46 | % |  | 1.82 |  |  | 1.64 | % | 0.48 | % |  | 1.12 | % |  | 0.88 | %
Expected life of options (years) |  | 6.5 |  |  | 5.3 |  |  | 7.0 |  |  | 4.6 |  |  | 5.6 |  |  | 5.7 |  | 3.6 |  |  | 7.3 |  |  | 4.4 |
Expected volatility of underlying stock |  | 50.97 | % |  | 51.72 | % |  | 50.68 |  |  | 47.69 | % |  | 51.86 |  |  | 51.81 | % | 51.00 | % |  | 50.59 | % |  | 53.89 | %
Expected quarterly dividends (per share) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  | — |  | — | — |  |  | — |
______________ During 2009, the Compensation Committee approved the award of 750,000 stock options that vest in five equal annual installments from 2010 to 2014 subject to the achievement of pre-tax income performance targets established by the Compensation Committee for fiscal years 2009 to 2013. The Compensation Committee has established the performance targets for fiscal years 201 1, 201 2 and 201 3, and these tranches were deemed granted for accounting purposes
Restricted Stock Units [Member] |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Compensation Expense Included in General and Administrative Expenses |
|  | Year ended December 31,
|  | 2014 |  | 2013 |  | 2012
|  | (in millions)
Restricted Stock Compensation Expense |  | $ | 13.4 |  | $ | 4.9 |  | $ | 7.1
Related Income Tax Benefit |  | $ | 5.4 |  | $ | 1.9 |  | $ | 1.5
Stock Options [Member] |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Compensation Expense Included in General and Administrative Expenses |
|  | Year ended December 31,
|  | 2014 |  | 2013 |  | 2012
|  | (in millions)
Stock Option Compensation Expense |  | $ | 5.2 |  | $ | 1.7 |  | $ | 2.4
Related Income Tax Benefit |  | $ | 2.1 |  | $ | 0.7 |  | $ | 1.0

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