Stock-based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Years
Shares
Outstanding at December 31, 2010	7,403
Granted	397
Exercised	(1,148)
Forfeited	(82)
Outstanding at December 31, 2011	6,570
Exercisable at December 31, 2011	5,581
Vested and expected to vest at December 31, 2011	6,435
Weighted-Average Exercise Price
Outstanding at December 31, 2010	$ 18.69
Granted	$ 35.00
Exercised	$ 12.06
Forfeited	$ 27.63
Outstanding at December 31, 2011	$ 20.73
Exercisable at December 31, 2011	$ 19.00
Vested and expected to vest at December 31, 2011	$ 20.59
Weighted-Average Remaining Contractual Term (in years)
Outstanding at December 31, 2010	5.6
Outstanding at December 31, 2011	5.0
Exercisable at December 31, 2011	4.4
Vested and expected to vest at December 31, 2011	5.0
Aggregate Intrinsic Value
Outstanding at December 31, 2011	$ 41,277
Exercisable at December 31, 2011	41,273
Vested and expected to vest at December 31, 2011	$ 41,276

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Gross number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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