Savings And Profit Sharing Plans (Schedule Of Company Contributions To Retirement Savings And Investment Plan) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Company contributions to the plans	$ 4,813	$ 4,586	$ 2,355
401(k) Plan [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Company contributions to the plans	4,813	4,586	2,210
Profit Sharing [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Company contributions to the plans	$ 0	$ 0	$ 145