Divestiture-Related Activities (Schedule Of Operating Results Of Operations Treated As Discontinued Operations) (Details) (USD $) In Thousands	3 Months Ended				9 Months Ended
	Sep. 25, 2011		Sep. 26, 2010		Sep. 25, 2011		Sep. 26, 2010
Divestiture-Related Activities [Abstract]
Net revenues	$ 56,980		$ 97,952		$ 197,332		$ 316,146
Costs and other expenses	43,694		83,809		177,449		280,556
Gain (loss) on disposition	(4)	[1]			52,265	[1]	38,562	[1]
Income from discontinued operations before income taxes	13,282		14,143		72,148		74,152
Provision for income taxes	2,969	[2]	2,595	[2]	(4,810)	[2]	29,215	[2]
Income from discontinued operations	10,313		11,548		76,958		44,937
Less: Income from discontinued operations attributable to noncontrolling interest	125		113		443		346
Income from discontinued operations attributable to common shareholders	$ 10,188		$ 11,435		$ 76,515		$ 44,591

[1] Gain on disposition for the nine months ended September 25, 2011 includes curtailment and settlement losses of approximately $11.5 million on the pension and other postretirement obligations that were transferred to the buyer in connection with the sale of the marine business and an adjustment related to pension and other postretirement liabilities of $3.5 million that occurred during the second quarter of 2011.

[2] The provision for income taxes for the nine months ended September 25, 2011 was impacted favorably by the realization of net tax benefits resulting from the resolution (including the expiration of statutes of limitation) of U.S. federal, state, and foreign tax matters relating to prior years and by the tax on the gain from sale of the marine business being incurred at significantly lower than statutory effective tax rates.