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Stock-Based Compensation (Tables)
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12 Months Ended |
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Dec. 31, 2014
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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| Summary of Stock Option Activity |
The following table presents a summary of stock option activity in 2014, 2013 and 2012 (in thousands, except for exercise prices and contractual terms): | | | | | | | | | | | | | | | Options Outstanding | | Weighted- Average Exercise Price | | Weighted- Average Remaining Contractual Term (in years) | | Aggregate Intrinsic Value | December 31, 2011 | 8,280 |
| | $ | 7.70 |
| | 5.90 | | $ | 127,308 |
| Granted | 1,595 |
| | 22.59 |
| | | | | Exercised | (3,128 | ) | | 0.72 |
| | | | | Forfeitures and expired | (335 | ) | | 19.79 |
| | | | | December 31, 2012 | 6,412 |
| | 14.17 |
| | 7.21 | | $ | 9,010 |
| Granted | 483 |
| | 10.23 |
| | | | | Exercised | (1,060 | ) | | 9.87 |
| | | | | Forfeitures and expired | (345 | ) | | 20.65 |
| | | | | December 31, 2013 | 5,490 |
| | 14.25 |
| | 6.52 | | $ | 28,769 |
| Granted | 403 |
| | 14.35 |
| | | | | Exercised | (388 | ) | | 8.01 |
| | | | | Forfeitures and expired | (337 | ) | | 21.43 |
| | | | | December 31, 2014 | 5,168 |
| | $ | 14.26 |
| | 5.73 | | $ | 7,732 |
| Vested and expected to vest at December 31, 2014 | 5,134 |
| | $ | 14.25 |
| | 5.71 | | $ | 7,720 |
| Exercisable at December 31, 2014 | 4,070 |
| | $ | 13.72 |
| | 5.11 | | $ | 7,367 |
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| Summary of Assumptions Used for Options Granted |
Below is a summary of the assumptions used for the stock options granted in the years indicated: | | | | | | | | | | | | | | 2014 | | 2013 | | 2012 | Weighted average exercise price per share | $ | 14.35 |
| | $ | 10.23 |
| | $ | 22.59 |
| Risk-free interest rate | 2.0 | % | | 1.0 | % | | 1.2 | % | Expected dividend yield | — |
| | — |
| | — |
| Expected volatility | 55.1 | % | | 58.9 | % | | 54.6 | % | Expected life (in years) | 5.75 |
| | 5.85 |
| | 5.67 |
| Forfeiture rate | 6.0 | % | | 5.0 | % | | 4.0 | % | Weighted average grant date fair value per share | $ | 7.43 |
| | $ | 5.48 |
| | $ | 11.26 |
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| Schedule of Share-based Payment Award, Equity Instruments Other than Options, Valuation Assumptions [Table Text Block] [Table Text Block] |
The assumptions for the market-based portion of the PSUs granted in 2014 are noted in the following table: | | | | | | 2014 | Grant price per share | $ | 11.54 |
| Risk-free interest rate | 1.4 | % | Expected dividend yield | — |
| Historical volatility | 50.0 | % | Expected life (in years) | 4.0 |
| Forfeiture rate | 6.0 | % | Weighted average grant date fair value per share | $ | 5.39 |
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| Summary of Restricted Stock Units Activity |
A summary of the RSU and PSU activity and related information is as follows: | | | | | | | | | | | | | | | | | | | | | | | Restricted Stock Units and Performance Stock Units | | Time Based | | Performance-Based | | Market-Based | | Number of Shares | | Weighted Average Grant Date Fair Value | | Number of Shares | | Weighted Average Grant Date Fair Value | | Number of Shares | | Weighted Average Grant Date Fair Value | Balance at December 31, 2011 | 56,855 |
| | $ | 23.97 |
| | — |
| | $ | — |
| | — |
| | $ | — |
| Awarded | 362,199 |
| | 9.72 |
| | — |
| | — |
| | — |
| | — |
| Vested | (56,855 | ) | | 23.97 |
| | — |
| | — |
| | — |
| | — |
| Canceled | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| Balance at December 31, 2012 | 362,199 |
| | 9.72 |
| | — |
| | — |
| | — |
| | — |
| Awarded | 1,016,035 |
| | 10.50 |
| | — |
| | — |
| | — |
| | — |
| Vested | (181,104 | ) | | 9.72 |
| | — |
| | — |
| | — |
| | — |
| Canceled | (98,613 | ) | | 10.39 |
| | — |
| | — |
| | — |
| | — |
| Balance at December 31, 2013 | 1,098,517 |
| | 10.38 |
| | — |
| | — |
| | — |
| | — |
| Awarded | 786,250 |
| | 14.33 |
| | — |
| | — |
| | 975,295 |
| | 5.39 |
| Vested | (393,106 | ) | | 10.15 |
| | — |
| | — |
| | — |
| | — |
| Canceled | (212,572 | ) | | 11.89 |
| | — |
| | — |
| | — |
| | — |
| Balance at December 31, 2014 | 1,279,089 |
| | $ | 12.63 |
| | — |
| | $ | — |
| | 975,295 |
| | $ | 5.39 |
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