Income Taxes (Schedule Of Net Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Postretirement benefits other than pensions	$ 432	$ 26,685
Inventoried costs		20,165
Net operating loss and tax credit carryforwards	131,359	139,070
Compensation and benefits	3,766	24,984
Deferred research & development cost		3,269
Income recognition on long-term contracts		22,402
Indemnification liabilities	7,440
Investments in and advances to affiliates		6,175
Property, plant and equipment	996
Other, net	4,022	5,850
Federal benefit of uncertain tax positions	9,931	29,576
Pension costs	15,746	93,948
Total deferred tax assets before valuation allowance	173,692	372,124
Less valuation allowance	(7,108)	(10,887)	(11,200)	(414,000)
Net deferred tax assets	166,584	361,237
Gain from installment sale	(38,818)
Property, plant and equipment		(27,515)
Intangible assets		(3,289)
Investments in and advances to affiliates	(9,883)
Total deferred tax liabilities	(48,701)	(30,804)
Current deferred tax assets	4,165	67,070
Long-term deferred tax assets	117,381	263,363
Long-term liabilities	(3,663)
Total deferred tax assets	$ 117,883	$ 330,433