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Stock-based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of share-based compensation, nonvested share, activity | The following table presents a summary of the Company’s stock-based compensation activity for the three months ended March 31, 2013 (in thousands):
| STOCK OPTIONS |  | RESTRICTED STOCK AWARDS |  | PERFORMANCE-BASED SHARE UNITS (1)
Outstanding at December 31, 2012 | 12,379 |  |  | 299 |  |  | — |
Granted | 1,282 |  |  | 219 |  |  | 52 |
Exercised or vested | (1,212 | ) |  | (3 | ) |  | — |
Forfeited or expired | (243 | ) |  | (10 | ) |  | (4 | )
Outstanding at March 31, 2013 | 12,206 |  |  | 505 |  |  | 48 |
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(1) | Share unit amounts represent the target number of PSUs considered granted for accounting recognition based on the establishment of performance targets for future years. The actual number of shares that will be earned upon vesting is dependent upon actual performance and may range from zero to 200% of the target number of shares.
Schedule of assumptions used to calculate fair value of options | The following assumptions were used to calculate the fair value of options granted for the periods indicated:
| THREE MONTHS ENDED MARCH 31,
| 2013 |  | 2012
Weighted-average risk-free interest rate | 1.09 | % |  | 1.15 | %
Dividend yield | — | % |  | — | %
Expected term | 6.3 years |  |  | 6.5 years |
Weighted-average volatility | 48.6 | % |  | 55.5 | %

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -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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