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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

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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 54 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 55 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(2, 3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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