Leases (Schedule Of Future Minimum Operating Lease Payments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leases, Operating [Abstract]
Total rental expense	$ 13,500,000	$ 11,600,000	$ 11,000,000
2013	12,556,000
2014	8,211,000
2015	7,702,000
2016	6,423,000
2017	3,783,000
After 2017	14,269,000
Total operating lease payments	$ 52,944,000