Acquisitions	12 Months Ended
Dec. 31, 2012
Acquisitions
Acquisitions	4. Acquisitions *Acquisition of EAS* On November 2, 2011, we acquired a 60% majority interest in Environmental Air Systems, LLC ("EAS"). EAS is a regional mechanical contractor with principal offices in Greensboro and Raleigh, North Carolina. EAS engages in a broad range of mechanical contracting projects, HVAC service and controls, and sophisticated prefabrication of mechanical systems, in North Carolina, South Carolina and throughout the Atlantic region. The acquisition date fair value of consideration transferred was $30.4 million, of which $15.7 million was allocated to goodwill. See Note 6 "Goodwill and Identifiable Intangible Assets, Net." *Acquisition of ColonialWebb* On July 28, 2010, we entered into a stock purchase agreement to purchase all of the issued and outstanding stock of ColonialWebb Contractors Company ("ColonialWebb"). ColonialWebb operates as a comprehensive, single-source construction, service, manufacturing and refrigeration service firm servicing the Mid-Atlantic region. ColonialWebb is headquartered in Richmond, Virginia with seven other locations. The acquisition date fair value of consideration transferred was $110.3 million, of which $49.9 million was allocated to goodwill. See Note 6 "Goodwill and Identifiable Intangible Assets, Net" for discussion of the goodwill impairment of ColonialWebb recorded during 2011. *Other Acquisitions* We completed various acquisitions from 2010 to 2012, which were not material, individually or in the aggregate, and were "tucked-in" with existing operations. Our consolidated balance sheet as of December 31, 2012 includes preliminary allocations of the purchase price to the assets acquired and liabilities assumed based on estimates of fair value, pending completion of final valuation and purchase price adjustments. The results of operations of acquisitions are included in our consolidated financial statements from their respective acquisition dates. Additional contingent purchase price ("earn-out") has been or will be paid if certain acquisitions achieve predetermined profitability targets. The total purchase price for these acquisitions, including earn-outs, was $14.2 million in 2012, $2.9 million in 2011 and $4.8 million in 2010.

Acquisitions

12 Months Ended

Dec. 31, 2012

4. Acquisitions

Acquisition of EAS

On November 2, 2011, we acquired a 60% majority interest in Environmental Air Systems, LLC ("EAS"). EAS is a regional mechanical contractor with principal offices in Greensboro and Raleigh, North Carolina. EAS engages in a broad range of mechanical contracting projects, HVAC service and controls, and sophisticated prefabrication of mechanical systems, in North Carolina, South Carolina and throughout the Atlantic region. The acquisition date fair value of consideration transferred was $30.4 million, of which $15.7 million was allocated to goodwill. See Note 6 "Goodwill and Identifiable Intangible Assets, Net."

Acquisition of ColonialWebb

On July 28, 2010, we entered into a stock purchase agreement to purchase all of the issued and outstanding stock of ColonialWebb Contractors Company ("ColonialWebb"). ColonialWebb operates as a comprehensive, single-source construction, service, manufacturing and refrigeration service firm servicing the Mid-Atlantic region. ColonialWebb is headquartered in Richmond, Virginia with seven other locations. The acquisition date fair value of consideration transferred was $110.3 million, of which $49.9 million was allocated to goodwill. See Note 6 "Goodwill and Identifiable Intangible Assets, Net" for discussion of the goodwill impairment of ColonialWebb recorded during 2011.

Other Acquisitions

We completed various acquisitions from 2010 to 2012, which were not material, individually or in the aggregate, and were "tucked-in" with existing operations. Our consolidated balance sheet as of December 31, 2012 includes preliminary allocations of the purchase price to the assets acquired and liabilities assumed based on estimates of fair value, pending completion of final valuation and purchase price adjustments. The results of operations of acquisitions are included in our consolidated financial statements from their respective acquisition dates. Additional contingent purchase price ("earn-out") has been or will be paid if certain acquisitions achieve predetermined profitability targets. The total purchase price for these acquisitions, including earn-outs, was $14.2 million in 2012, $2.9 million in 2011 and $4.8 million in 2010.