CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Unbilled Contracts Receivable (in dollars)	$ 131,333	$ 132,194
Income taxes payable ,reserve for uncertain tax positions (in dollars)	$ 326,121	$ 0
Common Stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	44,290,759	44,290,759
Treasury Stock, Shares	13,396,320	13,826,882