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Goodwill and Intangible Assets
3 Months Ended
Mar. 31, 2012
Goodwill and Intangible Assets [Abstract]  
Goodwill and Intangible Assets
(6)
Goodwill and Intangible Assets

Changes in the carrying amount of goodwill during the three months ended March 31, 2012 in connection with our recent acquisitions are shown in the tables below (in thousands):

         
Specialty
  
Management
    
   
Building
  
Civil
  
Contractors
  
Services
  
Total
 
                 
                 
Gross Goodwill
 $420,267  $430,762  $141,833  $66,638  $1,059,500 
Accumulated Impairment
  (146,847)  -   -   (20,051)  (166,898)
Balance at December 31, 2011
  273,420   430,762   141,833   46,587   892,602 
Acquisition related adjustment
  -   1,188   -   -   1,188 
Balance at March 31, 2012
 $273,420  $431,950  $141,833  $46,587  $893,790 

Intangible assets consist of the following (in thousands):

   
March 31, 2012
 
Weighted
         
Accumulated
    
Average
      
Accumulated
  
Impairment
  
Carrying
 
Amortization
   
Cost
  
Amortization
  
Charge
  
Value
 
Period
               
Trade names (non-amortizable)
 $117,600  $-  $(56,100) $61,500 
Indefinite
Trade names (amortizable)
  74,350   (1,698)  (800)  71,852 
20 years
Contractor license
  6,000   -   (680)  5,320 
Indefinite
Customer relationships
  39,800   (11,485)  -   28,315 
11.6 years
Construction contract backlog
  71,140   (45,167)  -   25,973 
2.9 years
Total
 $308,890  $(58,350) $(57,580) $192,960  

   
December 31, 2011
 
Weighted
         
Accumulated
    
Average
      
Accumulated
  
Impairment
  
Carrying
 
Amortization
   
Cost
  
Amortization
  
Charge
  
Value
 
Period
               
Trade names (non-amortizable)
 $117,600  $-  $(56,100) $61,500 
Indefinite
Trade names (amortizable)
  74,350   (788)  (800)  72,762 
20 years
Contractor license
  6,000   -   (680)  5,320 
Indefinite
Customer relationships
  39,800   (10,585)  -   29,215 
11.6 years
Construction contract backlog
  71,140   (41,938)  -   29,202 
2.9 years
Total
 $308,890  $(53,311) $(57,580) $197,999  
 
Amortization expense for the three months ended March 31, 2012 and 2011 was $5.0 million and $1.8 million, respectively.  As of March 31, 2012, amortization expense is estimated to be $13.3 million for the remainder of 2012, $15.9 million in 2013, $14.4 million in 2014, $8.5 million in 2015, $6.3 million in 2016 and $67.7 million thereafter.