Shareholders' Equity (Summary Of Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended
	Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
Number of Shares [Roll Forward]
Outstanding, Number of Shares, Beginning Balance	2,262,428
Granted, Number of Shares	470,386
Forfeited, Number of Shares	(130,793)
Vested, number of shares	(754,289)
Outstanding, Number of Shares, Ending Balance	1,847,732
Vested and expected to vest, end of period, Number of Shares	1,571,091
Aggregate Intrinsic Value [Roll Forward]
Outstanding, Aggregate Intrinsic Value, end of period	$ 125,257,752
Vested and expected to vest, aggregate intrinsic value, end of period	$ 101,097,755