Retirement Plans (Schedule Of Impacted Income Statement Line Items By The Recognition Of Retirement Plan Settlement Charges) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Expense For Settlement Allocation Of Recognized Period Costs [Line Items]
Total costs and expenses	$ 1,222	$ 1,803
Cost Of Revenue [Member]
Defined Benefit Plan Expense For Settlement Allocation Of Recognized Period Costs [Line Items]
Total costs and expenses
Selling, General, And Administrative [Member]
Defined Benefit Plan Expense For Settlement Allocation Of Recognized Period Costs [Line Items]
Total costs and expenses	1,222
Research And Development [Member]
Defined Benefit Plan Expense For Settlement Allocation Of Recognized Period Costs [Line Items]
Total costs and expenses
Restructuring And Reorganization [Member]
Defined Benefit Plan Expense For Settlement Allocation Of Recognized Period Costs [Line Items]
Total costs and expenses		$ 1,803