CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash, cash equivalents	$ 1,696	$ 12,044
Accounts receivable, retainage	$ 484,255	$ 382,891
STOCKHOLDERS' EQUITY:
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares issued	0	0
Common stock, shares authorized	75,000,000	75,000,000
Common stock, par value	$ 1	$ 1
Common stock, shares issued	49,072,710	48,671,492
Common stock, shares outstanding	49,072,710	48,671,492