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Mergers and Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Acquisitions That Are Material in the Aggregate [Member]
Pro Forma financial Information [Abstract]
Revenues	$ 864,160	$ 1,612,241
Income from Construction Operations	39,594	63,571
Net Income	19,333	27,065
Basic earnings per common share (in dollars per share)	$ 0.41	$ 0.57
Diluted earnings per common share (in dollars per share)	$ 0.40	$ 0.56
GreenStar Services Corporation [Member]
Pro Forma financial Information [Abstract]
Revenues	1,016,946	1,787,634
Income from Construction Operations	52,222	93,295
Net Income	28,205	48,169
Basic earnings per common share (in dollars per share)	$ 0.60	$ 1.02
Diluted earnings per common share (in dollars per share)	$ 0.59	$ 1.01
Lunda Construction Company [Member]
Pro Forma financial Information [Abstract]
Revenues	931,465	1,591,524
Income from Construction Operations	52,616	77,345
Net Income	$ 28,061	$ 38,063
Basic earnings per common share (in dollars per share)	$ 0.59	$ 0.81
Diluted earnings per common share (in dollars per share)	$ 0.59	$ 0.79

X

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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