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Stock Based Awards and Other Equity Instruments (Tables) | 6 Months Ended
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Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Status and Activity for Stock Option Awards Relating to Common Stock | A summary of the status and activity for stock option awards relating to our common stock for the six months ended June 30, 2013, is presented below:
|  | Options Outstanding |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Life |  |  | Aggregate Intrinsic Value |
|  | (In thousands) |  |  |  |  |  | (In years) |  |  | (In thousands) |
Options outstanding at January 1, 2013 |  |  | 8,654 |  |  | $ | 31.41 |  |  |  |  |  |  |  |  |
Granted |  |  | 1,562 |  |  |  | 46.35 |  |  |  |  |  |  |  |  |
Exercised |  |  | 875 |  |  |  | 22.69 |  |  |  |  |  |  | $ | 26,740 |
Cancelled |  |  | 321 |  |  |  | 36.23 |  |  |  |  |  |  |  |  |
Options outstanding at June 30, 2013 |  |  | 9,020 |  |  | $ | 34.67 |  |  |  | 6.0 |  |  | $ | 236,321 |
Exercisable as of June 30, 2013 |  |  | 3,756 |  |  | $ | 29.03 |  |  |  | 3.5 |  |  | $ | 119,593 |
Vested and expected to vest after June 30, 2013 |  |  | 8,439 |  |  | $ | 34.12 |  |  |  | 6.0 |  |  | $ | 223,343 |
Weighted-Average Assumptions of Estimated Fair Value of Stock Option Grants | The fair value of stock option grants under the 2011 Incentive Plan has been estimated at the date of grant using the Black–Scholes model with the following weighted average assumptions for the periods presented below:
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Risk free interest rate |  |  | 1.07 | % |  |  | 1.05 | % |  |  | 1.07 | % |  |  | 1.05 | %
Expected term (in years) |  |  | 6.25 |  |  |  | 6.21 |  |  |  | 6.25 |  |  |  | 6.21 |
Expected volatility |  |  | 51.82 | % |  |  | 53.34 | % |  |  | 51.73 | % |  |  | 53.34 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Summary of RSU Activity on Common Stock | The following table presents a summary of RSU activity on our common stock:
|  | RSUs Outstanding |  |  | Weighted Average Grant- Date Fair Value Per Share |
|  | (in thousands) |  |  |  |
Unvested RSUs outstanding as of January 1, 2013 |  |  | 446 |  |  | $ | 26.11 |
Granted |  |  | 994 |  |  |  | 47.05 |
Vested and released (1) |  |  | 306 |  |  |  | 22.01 |
Cancelled |  |  | 40 |  |  |  | 41.23 |
Unvested RSUs outstanding as of June 30, 2013 |  |  | 1,094 |  |  | $ | 45.13 |
(1) | Inclusive of 117,403 RSUs withheld to satisfy employee minimum tax withholding requirements using net shares settlement method. Total payments for the employees’ tax obligations to the taxing authorities were $5.5 million and $3.0 million for the six months ended June 30, 2013 and 2012, respectively, and are reflected as a financing activity within the consolidated statements of cash flows. RSUs that are withheld to satisfy employee minimum tax withholding requirements remain in the authorized but unissued pool under the 2011 Incentive Plan.
Summary of Unrecognized Compensation Expense, Net of Estimated Forfeitures and Weighted Average Period Remaining | A summary of the unrecognized compensation expense, net of estimated forfeitures, and the weighted average period remaining at June 30, 2013 related to our non-vested stock options and RSU awards is presented below (in thousands, except year information):
|  | Stock Options |  |  | RSUs |
Unrecognized compensation expense (net of forfeitures) |  | $ | 77,179 |  |  | $ | 32,234 |
Weighted average period remaining (in years) |  |  | 2.89 |  |  |  | 3.51 |

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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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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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