Equity (Schedule of Stock Option Activity) (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Number of Options
Options outstanding as of January 1, 2015	1,719,241
Granted
Exercised	(91,528)	(116,609)
Forfeited	(27,496)
Options outstanding as of March 31, 2015	1,600,217
Options exercisable as of March 31, 2015	860,358
Weighted Average Exercise Price
Options outstanding as of January 1, 2015	$ 43.89
Granted
Exercised	$ 22.13
Forfeited	$ 50.46
Options outstanding as of March 31, 2015	$ 44.53
Options exercisable as of March 31, 2015	$ 23.77

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

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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 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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