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Equity (Schedule of Stock Option Activity) (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Number of Options
Options Outstanding as of December 31, 2017 | shares	3,330,953
Granted | shares	135,000
Exercised | shares	(152,628)
Forfeited | shares	(761,582)
Options Outstanding as of December 31, 2018 | shares	2,551,743
Options exercisable as of December 31, 2018 | shares	1,556,519
Weighted Average Exercise Price
Options Outstanding as of December 31, 2017 | $ / shares	$ 31.53
Granted | $ / shares	21.63
Exercised | $ / shares	19.65
Forfeited | $ / shares	34.54
Options Outstanding as of December 31, 2018 | $ / shares	30.82
Options exercisable as of December 31, 2018 | $ / shares	$ 36.96

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- Definition

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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

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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 of the plan that expired.

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