Shareholders' Equity (Summary Of Outstanding Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years
Shareholders' Equity [Abstract]
Number of Shares, Outstanding at January 1, 2011	3,783,429
Number of Shares, Granted	1,105,039
Number of Shares, Exercised	(7,558)
Number of Shares, Forfeited	(22,149)
Number of Shares, Canceled	(541,892)
Number of Shares, Outstanding at December 31, 2011	4,316,869
Number of Shares, Vested and expected to vest at December 31, 2011	4,316,869
Number of Shares, Exercisable at December 31, 2011	2,421,685
Weighted Average Exercise Price Per Share, Outstanding at January 1, 2011	$ 17.51
Weighted Average Exercise Price Per Share, Granted	$ 11.11
Weighted Average Exercise Price Per Share, Exercised	$ 11.97
Weighted Average Exercise Price Per Share, Forfeited	$ 11.34
Weighted Average Exercise Price Per Share, Canceled	$ 16.19
Weighted Average Exercise Price Per Share, Outstanding at December 31, 2011	$ 16.04
Weighted Average Exercise Price Per Share, Vested and expected to vest at December 31, 2011	$ 16.04
Weighted Average Exercise Price Per Share, Exercisable at December 31, 2011	$ 18.62
Weighted Average Remaining Contractual Term (In Years), Outstanding at December 31, 2011	6.97
Weighted Average Remaining Contractual Term (In Years), Vested and expected to vest at December 31, 2011	6.97
Weighted Average Remaining Contractual Term (In Years), Exercisable at December 31, 2011	6.91
Aggregate Intrinsic Value, Outstanding at December 31, 2011	$ 51,275
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2011	51,275
Aggregate Intrinsic Value, Exercisable at December 31, 2011	$ 48,275