Stock-based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Shares
Outstanding at December 31, 2012	6,642
Granted	1,029
Exercised	(325)
Forfeited	(8)
Outstanding at December 31, 2013	7,338	6,642
Exercisable at December 31, 2013	5,973
Vested and expected to vest at December 31, 2013	7,270
Weighted-Average Exercise Price
Outstanding at December 31, 2012	$ 21.64
Granted	$ 24.58
Exercised	$ 14.22
Forfeited	$ 21.40
Outstanding at December 31, 2013	$ 22.38	$ 21.64
Exercisable at December 31, 2013	$ 21.82
Vested and expected to vest at December 31, 2013	$ 22.36
Weighted-Average Remaining Contractual Term (in years)
Outstanding at December 31, 2012	4 years 7 months 6 days	4 years 8 months 12 days
Outstanding at December 31, 2013	4 years 7 months 6 days	4 years 8 months 12 days
Exercisable at December 31, 2013	3 years 7 months 6 days
Vested and expected to vest at December 31, 2013	4 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding at December 31, 2013	$ 61,036
Exercisable at December 31, 2013	53,284
Vested and expected to vest at December 31, 2013	$ 60,649

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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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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