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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Stock Option Activity | A summary of the stock option activity for the year ended December 31, 2013 is provided below:
| Number of Shares Underlying Options (in thousands) |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value (in millions) |
Outstanding at beginning of period |  | 4,065 |  |  | $ | 6.12 |  |  |  | 2.65 |  |  |  |  |
Granted |  | 1,836 |  |  | $ | 7.55 |  |  |  | 4.08 |  |  |  |  |
Exercised |  | (877 | ) |  | $ | 4.25 |  |  |  | 0 |  |  |  |  |
Forfeited |  | (97 | ) |  | $ | 7.51 |  |  |  | 3.57 |  |  |  |  |
Outstanding at end of period |  | 4,927 |  |  | $ | 6.95 |  |  |  | 2.85 |  |  | $ | 2.81 |
Vested - end of period |  | 3,459 |  |  | $ | 6.58 |  |  |  | 2.44 |  |  | $ | 2.66 |
Vested and expected to vest - end of period |  | 4,854 |  |  | $ | 6.95 |  |  |  | 2.85 |  |  | $ | 2.81 |
A Summary of the Values of Options Granted and Exercised | A summary of the values of options granted and exercised for each of the years ended December 31, 2013, 2012 and 2011 is provided below:
| 2013 |  |  | 2012 |  |  | 2011 |
Options granted - (thousands) |  | 1,836 |  |  |  | 1,024 |  |  |  | 1,169 |
Weighted average grant date fair value - ($/share) | $ | 2.45 |  |  | $ | 3.49 |  |  | $ | 2.09 |
Weighted average exercise price - ($/share) | $ | 4.25 |  |  | $ | 4.62 |  |  | $ | 4.12 |
Options exercised (thousands) |  | 877 |  |  |  | 759 |  |  |  | 302 |
Total intrinsic value of options exercised - ($thousands) | $ | 1,201 |  |  | $ | 3,267 |  |  | $ | 859 |
The Valuation of the Options Granted | The valuation of the options granted is based upon a Black Scholes model. The table below summarizes the assumptions used to value the options issued in 2013 and 2012.
Year |  | Options Issued (in thousands) |  | Weighted Avg. Volatility |  | Expected Term |  | Risk Free Interest Rate |  | Expected Dividend Yield
2013 |  | 1,836 |  | 51% |  | 2.5 years |  | 0.3% |  | 0%
2012 |  | 1,024 |  | 65% |  | 2.5 years |  | 0.5% |  | 0%
2011 |  | 1,169 |  | 47% |  | 2.5 years |  | 0.8% |  | 0%

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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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