CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Revenues	$ 819,858	$ 914,376	$ 1,435,147	$ 1,779,451
Cost of Operations	732,648	815,464	1,285,474	1,604,406
Gross Profit	87,210	98,912	149,673	175,045
General and Administrative Expenses	50,175	43,061	94,125	85,037
INCOME FROM CONSTRUCTION OPERATIONS	37,035	55,851	55,548	90,008
Other Income (Expense), net	1,232	(1,102)	785	(757)
Interest Expense	(7,252)	(3,244)	(14,407)	(4,765)
Income before Income Taxes	31,015	51,505	41,926	84,486
Provision for Income Taxes	(11,321)	(18,780)	(15,303)	(30,828)
NET INCOME	$ 19,694	$ 32,725	$ 26,623	$ 53,658
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.42	$ 0.67	$ 0.56	$ 1.09
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.41	$ 0.66	$ 0.56	$ 1.09
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	47,183	49,001	47,142	49,013
Effect of Dilutive Stock Options and Restricted Stock Units Outstanding	776	535	769	436
DILUTED (in shares)	47,959	49,536	47,911	49,449