Share-Based Compensation (Schedule Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Stock Options [Member]
Number of Shares, Outstanding at December 31, 2011	3,648
Number of Shares, Granted	747
Number of Shares, Cancelled	(426)
Number of Shares, Outstanding at March 31, 2012	3,969
Number of Shares, Exercisable at March 31, 2012	1,584
Weighted-Average Exercise Price Per Share, Outstanding at December 31, 2011	$ 7.98
Weighted-Average Exercise Price Per Share, Granted	$ 2.28
Weighted-Average Exercise Price Per Share, Cancelled	$ 8.74
Weighted-Average Exercise Price Per Share, Outstanding at March 31, 2012	$ 6.88
Weighted-Average Exercise Price Per Share, Exercisable at March 31, 2012	$ 8.26
Weighted-Average Remaining Contractual Term (in yrs), Outstanding at December 31, 2011	7.81
Weighted-Average Remaining Contractual Term (in yrs), Outstanding at March 31, 2012	7.91
Weighted-Average Remaining Contractual Term (in yrs), Exercisable at March 31, 2012	5.90
Aggregate Intrinsic Value of In-the-Money Options, Outstanding at March 31, 2012	$ 2
Stock Options That Contain Performance And Market-Based Conditions [Member]
Number of Shares, Outstanding at December 31, 2011	440
Number of Shares, Cancelled	(250)
Number of Shares, Outstanding at March 31, 2012	190
Number of Shares, Exercisable at March 31, 2012	40
Weighted-Average Exercise Price Per Share, Outstanding at December 31, 2011	$ 9.75
Weighted-Average Exercise Price Per Share, Cancelled	$ 9.23
Weighted-Average Exercise Price Per Share, Outstanding at March 31, 2012	$ 10.43
Weighted-Average Exercise Price Per Share, Exercisable at March 31, 2012	$ 13.81
Weighted-Average Remaining Contractual Term (in yrs), Outstanding at December 31, 2011	9.07
Weighted-Average Remaining Contractual Term (in yrs), Outstanding at March 31, 2012	8.80
Weighted-Average Remaining Contractual Term (in yrs), Exercisable at March 31, 2012	7.66