CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Revenues	$ 1,166,410	$ 731,806	$ 2,601,557	$ 2,511,257
Cost of Operations	1,046,055	641,136	2,331,529	2,245,542
Gross Profit	120,355	90,670	270,028	265,715
General and Administrative Expenses	58,319	40,710	152,444	125,747
INCOME FROM CONSTRUCTION OPERATIONS	62,036	49,960	117,584	139,968
Other Income (Expense), net	5,863	358	6,648	(399)
Interest Expense	(11,566)	(1,589)	(25,973)	(6,354)
Income before Income Taxes	56,333	48,729	98,259	133,215
Provision for Income Taxes	(20,856)	(17,796)	(36,159)	(48,624)
NET INCOME	$ 35,477	$ 30,933	$ 62,100	$ 84,591
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.75	$ 0.65	$ 1.32	$ 1.75
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.74	$ 0.65	$ 1.30	$ 1.73
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	47,291	47,357	47,192	48,455
Effect of Dilutive Stock Options and Restricted Stock Units Outstanding (in shares)	473	539	670	498
DILUTED (in shares)	47,764	47,896	47,862	48,953