Restructuring Charges (Schedule Of Restructuring Activity) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring Cost and Reserve [Line Items]
Accrued liability as of January 1	$ 2,179	$ 20,374
Charges			34,168
Payments	(775)	(18,195)	(13,062)
Non-cash items	(1,154)		(732)
Accrued liability as of December 31	250	2,179	20,374
Restructuring charges			34,168
Employee Severance And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liability as of January 1	1,710	19,056
Charges			31,018
Payments	(775)	(17,346)	(11,859)
Non-cash items	(685)		(103)
Accrued liability as of December 31	250	1,710	19,056
Other [Member]
Restructuring Cost and Reserve [Line Items]
Accrued liability as of January 1	469	1,318
Charges			3,150
Payments		(849)	(1,203)
Non-cash items	(469)		(629)
Accrued liability as of December 31		$ 469	$ 1,318