Share-Based Compensation - Schedule of Share Based Compensation Stock Options Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Stock Options, Shares:
Outstanding Beginning Shares	2,736
Exercised Shares	(368)
Outstanding Ending Shares	2,368
Shares Exercisable	1,840
Weighted Average Exercise Price:
Outstanding Beginning Weighted Average Exercise Price	$ 21.26
Exercised Weighted Average Exercise Price	$ 15.36
Outstanding Ending Weighted Average Exercise Price	$ 22.18
Exercisable Weighted Average Exercise Price	$ 21.51
Weighted Average Remaining Contractual Term:
Outstanding Weighted Average Remaining Contractual Term	4 years
Exercisable Weighted Average Remaining Contractual Term	3 years
Aggregate Intrinsic Value :
Outstanding Intrinsic Value	$ 17,840
Exercised Intrinsic Value	5,279
Outstanding Intrinsic Value	15,276
Exercisable Intrinsic Value	$ 13,094

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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

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