CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CONDENSED CONSOLIDATED BALANCE SHEETS [Abstract]
Accounts receivable, retainage	$ 512,808	$ 484,255
Accumulated depreciation	280,059	254,477
Accounts payable, retainage	222,175	204,767
Unamortized discount and debt issuance cost	$ 63,297	$ 6,697
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares issued	0	0
Common stock, shares authorized	75,000,000	75,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued	49,169,813	49,072,710
Common stock, shares outstanding	49,169,813	49,072,710