Employee Benefit Plans (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shares
Outstanding at December 31, 2013	2,989
Options granted	1,026	576	983
Exercised	(648)
Forfeited	(161)
Outstanding as of December 31, 2014	3,206	2,989
Vested and expected to vest at December 31, 2014	3,099
Exercisable at December 31, 2014	1,860
Weighted average exercise price
Outstanding at December 31, 2013	$ 11.80
Granted	$ 42.74
Exercised	$ 10.40
Forfeited	$ 33.57
Outstanding as of December 31, 2014	$ 20.90	$ 11.80
Vested and expected to vest at December 31, 2014	$ 20.37
Exercisable at December 31, 2014	$ 9.91
Remaining contractual term (years)
Outstanding	6 years 9 months	6 years 6 months 18 days
Vested and expected to vest at December 31, 2014	6 years 8 months 5 days
Exercisable at December 31, 2014	5 years 2 months 1 day
Aggregate intrinsic value
Outstanding	$ 140,029	$ 142,377
Vested and expected to vest at December 31, 2014	136,960
Exercisable at December 31, 2014	$ 101,665

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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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 remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Number of share options (or share units) exercised during the current period.

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