Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities:
Net income	$ 97,421	$ 9,708
Adjustments to reconcile net income to net cash used in operating activities:
Non-cash operating items (Note 3)	(31,510)	17,662
Changes in operating assets and liabilities:
Contracts-in-process	(74,031)	(55,861)
Inventories	(13,785)	9,562
Long-term receivables	(1,553)	(2,927)
Other current assets and other assets	(5,045)	(1,245)
Accounts payable	(11,065)	8,206
Accrued expenses and other current liabilities	(4,645)	(5,161)
Customer advances	52,177	13,341
Income taxes payable	(3,700)	888
Pension and other postretirement liabilities	(4,796)	(1,835)
Long-term liabilities	(1,999)	214
Net cash used in operating activities	(2,531)	(7,448)
Investing activities:
Capital expenditures	(17,711)	(26,983)
Proceeds from sale of net assets	61,482
Increase in restricted cash	(11,275)
Net cash provided by (used in) investing activities	32,496	(26,983)
Financing activities:
Proceeds from the exercise of stock options	447	8,334
Funding of withholding taxes on employee cashless stock option exercises	(16,765)	(443)
Excess tax benefit associated with exercise of stock options	1,361
Net cash (used in) provided by financing activities	(14,957)	7,891
Decrease in cash and cash equivalents	15,008	(26,540)
Cash and cash equivalents - beginning of period	165,801	168,205
Cash and cash equivalents - end of period	$ 180,809	$ 141,665