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Stock-Based and Other Incentive Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock options outstanding under equity-based compensation plans | A summary of the changes in stock options outstanding under our equity-based compensation plans during 2015 is presented below:
|  | Number of Options |  | Weighted Average Remaining Contract Term (Years) |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Options outstanding as of December 31, 2014 |  | 1.6 |  |  | 6.3 |  | $ | 11.61 |  |  | $ | 4.0 |
Granted |  | 0.8 |  |  |  |  | $ | 12.76 |  |  | $ | — |
Exercised |  | (0.3 | ) |  |  |  | $ | 9.68 |  |  | $ | 1.2 |
Cancelled |  | (0.3 | ) |  |  |  | $ | 14.52 |  |  | $ | — |
Options outstanding as of December 31, 2015 |  | 1.8 |  |  | 7.5 |  | $ | 12.04 |  |  | $ | 0.1 |
Options exercisable as of December 31, 2015 |  | 0.7 |  |  | 5.6 |  | $ | 10.54 |  |  | $ | 0.1 |
Options expected to vest after December 31, 2015 |  | 1.1 |  |  | 8.8 |  | $ | 13.00 |  |  | $ | — |
Schedule of valuation assumptions | The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model. The weighted-average assumptions used in the model are outlined in the following table:
|  | 2015 |  | 2014 |  | 2013
Assumptions: |  |  |  |  |  |
Expected volatility |  | 52 | % |  | 57 | % |  | 60 | %
Risk-free interest rate |  | 1.7 | % |  | 2.3 | % |  | 2.2 | %
Dividend yield |  | — |  |  | — |  |  | — |
Expected life (in years) |  | 6 |  |  | 6 |  |  | 6 |
RSUs outstanding under equity-based compensation plans | A summary of the changes in RSUs outstanding under our equity-based compensation plans during 2015 is presented below:
|  | Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested RSUs as of December 31, 2014 |  | 5.0 |  |  | $ | 13.12 |
Granted |  | 2.9 |  |  | $ | 12.95 |
Vested |  | (1.5 | ) |  | $ | 13.12 |
Cancelled |  | (0.8 | ) |  | $ | 14.32 |
Unvested RSUs as of December 31, 2015 |  | 5.6 |  |  | $ | 13.05 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(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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