Goodwill And Related Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill And Related Intangible Assets [Abstract]
Balance as of the beginning of the year	$ 348,326,000	$ 298,346,000
Acquired goodwill	15,011,000	50,526,000
Impairment	(4,328,000)		(66,589,000)
Foreign currency translation	854,000	(546,000)
Balance as of the end of the year	$ 359,863,000	$ 348,326,000	$ 298,346,000