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Stock Based Awards and Other Equity Instruments (Tables)

12 Months Ended

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

X

- Definition

Summary of unrecognized stock based compensation by award type, net of forfeitures and the weighted average remaining amortization period.

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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)

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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)

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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)

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