Income Taxes (Schedule Of Net Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of Deferred Tax Assets and Liabilities [Abstract]
Postretirement benefits other than pensions	$ 26,685	$ 25,504
Inventoried costs	20,165	24,666
Net operating loss and tax credit carryforwards	139,070	151,497
Compensation and benefits	24,984	26,996
Deferred research & development costs	3,269	6,575
Income recognition on long-term contracts	22,402	24,686
Investments in and advances to affiliates	6,175	34,227
Other, net	5,850	5,468
Federal benefit of uncertain tax positions	29,576	29,249
Pension costs	93,948	70,268
Total deferred tax assets before valuation allowance	372,124	399,136
Less valuation allowance	(10,887)	(11,228)	(414,000)
Net deferred tax assets	361,237	387,908
Property, plant and equipment	(27,515)	(23,189)
Intangible assets	(3,289)	(4,480)
Total deferred tax liabilities	(30,804)	(27,669)
Current deferred tax assets	67,070	66,220
Long-term deferred tax assets	263,363	294,019
Total deferred tax assets	$ 330,433	$ 360,239