Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
CURRENT ASSETS:
Cash equivalents	$ 19,197	$ 127,879
Accounts receivable, retainage	358,511	271,778
CURRENT LIABILITIES:
Accounts payable, retainage	$ 151,907	$ 280,867
STOCKHOLDERS' EQUITY:
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	47,329,275	47,089,593
Common stock, shares outstanding (in shares)	47,329,275	47,089,593