Accumulated Other Comprehensive (Loss) Income (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Ending balance	$ (222,922)	$ (164,196)	$ (91,860)	$ (100,642)
Current period change	(89,215)	(72,350)	218
Tax benefit (expense)	30,489	14	8,564
Foreign Currency Translation Adjustments [Member]
Ending balance	56,245	69,605	132,234	97,962
Current period change	(17,269)	(56,620)	39,354
Tax benefit (expense)	3,909	(6,009)	(5,082)
Net Transition Asset [Member]
Ending balance			6	12
Current period change		(9)	(10)
Tax benefit (expense)		3	4
Net Prior Service Benefit [Member]
Ending balance	5,067	6,431	8,286	13,782
Current period change	(2,158)	(2,978)	(8,556)
Tax benefit (expense)	794	1,123	3,060
Net Benefit Plan Loss [Member]
Ending balance	(283,258)	(239,094)	(231,143)	(211,545)
Current period change	(70,046)	(12,907)	(29,901)
Tax benefit (expense)	25,882	4,956	10,303
Unrealized Gain (Loss) On Marketable Securities [Member]
Ending balance	(3)	(3)	(4)	(5)
Current period change	1	1	1
Tax benefit (expense)	(1)
Other (Expenses) Income [Member]
Ending balance	(973)	(1,135)	(1,239)	(848)
Current period change	257	163	(670)
Tax benefit (expense)	$ (95)	$ (59)	$ 279