Equity Incentive Plans (Schedule Of Equity Incentive Plans, Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years	Dec. 31, 2009 years
Equity Incentive Plans [Abstract]
Beginning balance, Shares	4,947,348	5,169,653	5,206,374
Beginning balance, Weighted-Average Exercise Price	$ 27.93	$ 27.71	$ 27.72
Beginning balance, Weighted-Average Remaining Contractual Life (in years)	3.7	4.6	5.6
Beginning balance, Aggregate Intrinsic Value	$ 334		$ 6,220
Exercised, Shares	(86,860)		(1,280)
Exercised, Weighted-Average Exercise Price	$ 15.05		$ 10.63
Forfeited, Shares	(503,503)	(222,305)	(35,441)
Forfeited, Weighted-Average Exercise Price	$ 22.72	$ 23.23	$ 29.58
Ending balance, Shares	4,356,985	4,947,348	5,169,653
Ending balance, Weighted-Average Exercise Price	$ 28.86	$ 27.93	$ 27.71
Ending balance, Weighted-Average Remaining Contractual Life (in years)	3.0	3.7	4.6
Ending balance, Aggregate Intrinsic Value	37	334
Exercisable, Shares	4,139,531
Exercisable, Weighted-Average Exercise Price	$ 29.15
Exercisable, Weighted-Average Remaining Contractual Life (in years)	2.9
Exercisable, Aggregate Intrinsic Value	$ 37