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Stock Options (Tables) | 3 Months Ended
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Mar. 31, 2014
Fair Value Assumptions on Stock Options | The fair value of stock option awards was estimated using the Black-Scholes option pricing model with the following assumptions and weighted-average fair values:
|  | Three Months Ended March 31, |
|  | 2014 |  |  | 2013 |
Weighted-average fair value of grant |  | $ | 11.28 |  |  | $ | 8.86 |
Risk-free interest rate |  |  | 1.04 | % |  |  | .54 | %
Expected volatility |  |  | 45.65 | % |  |  | 50.19 | %
Expected life of options in years |  |  | 3.71 |  |  |  | 3.69 |
Expected dividend yield |  |  | — |  |  |  | — |
Summary of Stock Option Activity | A summary of stock option activity for the three months ended March 31, 2014 follows (shares in thousands):
Options |  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value ($ in millions) |
Outstanding at December 31, 2013 |  |  | 2,698 |  |  | $ | 32.74 |  |  |  |  |  |  |  |  |
Granted |  |  | 745 |  |  |  | 32.30 |  |  |  |  |  |  |  |  |
Exercised |  |  | (232 | ) |  |  | 13.24 |  |  |  |  |  |  |  |  |
Forfeited and expired |  |  | (132 | ) |  |  | 137.32 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2014 |  |  | 3,079 |  |  |  | 29.65 |  |  |  | 3.10 |  |  | $ | 11.2 |
Expected to vest at March 31, 2014 |  |  | 1,446 |  |  |  | 27.24 |  |  |  | 4.22 |  |  |  | 6.0 |
Exercisable at March 31, 2014 |  |  | 1,579 |  |  |  | 31.88 |  |  |  | 2.03 |  |  |  | 5.1 |
Summary of Restricted Stock Unit Activity | A summary of restricted stock unit activity for the three months ended March 31, 2014 follows (shares in thousands):
|  | Restricted Stock Units |  |  | Weighted- Average Grant-Date Fair Value |
Outstanding at December 31, 2013 |  |  | 401 |  |  | $ | 23.45 |
Granted |  |  | 392 |  |  |  | 32.22 |
Vested |  |  | (73 | ) |  |  | 27.29 |
Forfeited and expired |  |  | (181 | ) |  |  | 23.88 |
Outstanding at March 31, 2014 |  |  | 539 |  |  |  | 29.15 |

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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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