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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2013
Stock-Based Compensation |
Summary of Restricted Stock Awards Activity | A summary of restricted stock awards activity for the six months ended June 30, 2013 is as follows:
|  |  |  |  |  | Aggregate |
|  |  |  | Weighted Average |  | Intrinsic |
|  | Number |  | Grant Date |  | Value |
|  | of Shares |  | Fair Value |  | (in thousands) |
Granted and Unvested - January 1, 2013 |  | 1,141,666 |  | $ | 18.12 |  | $ | 15,641 |
Vested |  | (236,666 | ) | $ | 14.40 |  | $ | 4,318 |
Granted |  | 178,335 |  | $ | 19.30 |  | $ | 3,226 |
Forfeited |  | (66,667 | ) | $ | 14.23 |  | — |
Total Granted and Unvested |  | 1,016,668 |  | $ | 19.45 |  | $ | 18,392 |
Approved for grant |  | 710,000 |  |  | (a) | $ | 12,844 |
Total Awarded and Unvested - June 30, 2013 |  | 1,726,668 |  | n.a. |  | $ | 31,235 |
(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 Awards | The outstanding unvested restricted stock awards at June 30, 2013 are scheduled to vest as follows, subject where applicable to the achievement of performance targets. As described above, certain performance targets have not yet been established.
|  | Number |
Vesting Date |  | of Awards |
2013 |  | 610,000 |
2014 |  | 391,668 |
2015 |  | 150,000 |
2016 |  | 165,000 |
2017 |  | 410,000 |
Total |  | 1,726,668 |
Summary of Stock Options Activity | A summary of stock options activity under the plan for the six months ended June 30, 2013 is as follows:
|  |  |  | Weighted Average |
|  | Number |  | Grant Date |  | Exercise |
|  | of Shares |  | Fair Value |  | Price |
Total Granted and Outstanding - January 1, 2013 |  | 1,315,465 |  | $ | 9.72 |  | $ | 18.91 |
Granted |  | 150,000 |  | $ | 6.93 |  | $ | 20.33 |
Exercised |  | (40,465 | ) | $ | 6.18 |  | $ | 13.77 |
Forfeited |  | (50,000 | ) | $ | 7.25 |  | — |
Total Granted and Outstanding |  | 1,375,000 |  | $ | 9.61 |  | $ | 19.45 |
Approved for grant |  | 680,000 |  |  | (a) | $ | 11.14 |
Total Awarded and Outstanding - June 30, 2013 |  | 2,055,000 |  | n.a. |  | $ | 16.70 |
(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 | The fair value of this tranche was determined based on the Black Scholes option pricing model using the following key assumptions:
Risk-free interest rate |  | 0.48% |
Expected life of options |  | 3.6 years |
Expected volatility of underlying stock |  | 51.00% |
Expected quarterly dividends (per share) |  | $0.00 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 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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