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Stock Based Awards and Other Equity Instruments (Tables) | 12 Months Ended
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Dec. 31, 2012
Stock Based Awards and Other Equity Instruments [Abstract] |
Summary of the status and activity for stock option awards relating to our common stock |
|  | 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, 2012 |  |  | 6,575 |  |  | $ | 23.65 |  |  |  |  |  |  |  |  |
Granted |  |  | 3,651 |  |  |  | 39.79 |  |  |  |  |  |  |  |  |
Exercised |  |  | 1,151 |  |  |  | 14.09 |  |  |  |  |  |  | $ | 25,074 |
Cancelled |  |  | 421 |  |  |  | 29.42 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2012 |  |  | 8,654 |  |  | $ | 31.41 |  |  |  | 5.7 |  |  | $ | 92,083 |
Exercisable as of December 31, 2012 |  |  | 3,329 |  |  | $ | 27.23 |  |  |  | 3.1 |  |  | $ | 49,016 |
Vested and expected to vest after December 31, 2012 |  |  | 7,655 |  |  | $ | 30.65 |  |  |  | 5.7 |  |  | $ | 86,121 |
Black-Scholes assumptions used in calculating the estimated fair value of stock options granted |
|  | 2012 |
Risk-free interest rate |  |  | 1.03 | %
Expected volatility |  |  | 53.46 | %
Expected life (in years) |  |  | 6.21 |
Dividend yield |  |  | — |
Weighted-average estimated fair value of options granted during the year |  | $ | 20.36 |
Summary of RSU activity on common stock |
|  | RSUs Outstanding |  |  | Weighted Average Grant- Date Fair Value Per Share |
|  | (In thousands) |
Unvested RSUs outstanding as of January 1, 2012 |  |  | 926 |  |  | $ | 21.32 |
Granted |  |  | 85 |  |  |  | 35.76 |
Vested and released (1) |  |  | 548 |  |  |  | 17.17 |
Cancelled |  |  | 17 |  |  |  | 26.78 |
Unvested RSUs outstanding as of December 31, 2012 (2) |  |  | 446 |  |  | $ | 26.11 |
(1) | Inclusive of 190,856 RSUs withheld to satisfy minimum tax withholding requirements.
(2) | Included in RSUs outstanding at December 31, 2012 are 200,000 performance based RSUs for which vesting is tied to achievement of performance targets and a requisite service period.
Summary of the unrecognized compensation expense, net of estimated forfeitures and the weighted average period remaining |
|  | Stock Options |  |  | RSUs |
Unrecognized compensation expense (net of forfeitures) |  | $ | 59,686 |  |  | $ | 4,486 |
Weighted average period remaining (in years) |  |  | 3.0 |  |  |  | 1.8 |

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- Definition Summary of unrecognized stock based compensation by award type, net of forfeitures and the weighted average remaining amortization period. + References No definition available. + Details
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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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