Restructuring And Impairment Costs (Reconciliation Of Company's Liability For The Restructuring Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Mar. 31, 2011
Restructuring Cost and Reserve [Line Items]
Costs charged to expense	$ 10,220	$ 11,791
Payments	(15,011)	(5,180)
Balance	1,820	6,611
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Costs charged to expense	7,123	11,155
Payments	(12,017)	(4,769)
Balance	1,492	6,386
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs charged to expense	3,097	636
Payments	(2,994)	(411)
Balance	$ 328	$ 225