Leases And Related Party Leases (Schedule Of Minimum Lease Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Operating Leased Assets [Line Items]
2012	$ 12,112
2013	11,184
2014	9,807
2015	6,260
2016	3,442
Thereafter	5,395
Total minimum lease payments	48,200
Related Parties [Member]
Operating Leased Assets [Line Items]
2012	1,009
2013	1,027
2014	1,027
2015	974
2016	974
Thereafter	1,879
Total minimum lease payments	6,890
Third Parties [Member]
Operating Leased Assets [Line Items]
2012	11,103
2013	10,157
2014	8,780
2015	5,286
2016	2,468
Thereafter	3,516
Total minimum lease payments	$ 41,310