CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash equivalents	$ 23,140	$ 19,197
Accounts receivable, retainage	354,269	358,511
CURRENT LIABILITIES:
Accounts payable, retainage	$ 137,662	$ 151,907
STOCKHOLDERS' EQUITY:
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
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)	47,556,056	47,329,275
Common stock, shares outstanding (in shares)	47,556,056	47,329,275