Commitments And Contingencies (Schedule Of Minimum Rental Payments For Operating Leases) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
2013	$ 3,652,000
2014	3,403,000
2015	3,187,000
2016	3,068,000
2017	2,890,000
Thereafter	132,052,000
Total	148,252,000
Rental expense, operating leases	$ 5,700,000	$ 5,400,000	$ 5,300,000