Goodwill And Related Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill And Related Intangible Assets [Abstract]
Balance as of the beginning of the year	$ 298,346,000	$ 365,653,000
Acquired goodwill	50,526,000
Impairment		(66,589,000)	(59,008,000)
Foreign currency translation	(546,000)	(718,000)
Balance as of the end of the year	$ 348,326,000	$ 298,346,000	$ 365,653,000