Goodwill And Other Intangible Assets (Schedule Of Estimated Annual Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill And Other Intangible Assets [Abstract]
2012	$ 41,700
2013	41,700
2014	37,700
2015	31,500
2016	31,500
Amortization expense of intangible assets	$ 44,113	$ 42,244	$ 42,638