Accrued Restructuring Costs (Schedule Of Restructuring Reserve) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost And Reserve [Line Items]
Restructuring reserve	$ 1,043	$ 4,869
Accrued Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve	626	3,671
Other Long-Term Liabilities [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve	$ 417	$ 1,198