Leases (Schedule Of Future Minimum Operating Lease Payments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leases [Abstract]
Total rental expense	$ 11,600,000	$ 11,000,000	$ 10,100,000
2012	12,076,000
2013	8,621,000
2014	6,263,000
2015	5,023,000
2016	3,660,000
After 2016	5,585,000
Total operating lease payments	$ 41,228,000