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Reportable Operating Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
segment
Jun. 30, 2013
Dec. 31, 2013
Reportable Operating Segments          
Number of operating segments     3    
Segment reporting information          
Revenue $ 515,291 $ 445,013 $ 985,365 $ 855,008  
% of Segment Revenue 100.00% 100.00% 100.00% 100.00%  
Gross Profit 61,194 59,537 110,951 105,633  
% of Segment Revenue 11.90% 13.40% 11.30% 12.40%  
Goodwill 118,626   118,626   118,626
East
          
Segment reporting information          
Revenue 278,066 175,398 501,138 365,609  
% of Segment Revenue 54.00% 39.40% 50.90% 42.80%  
Gross Profit 21,309 15,215 37,325 30,210  
% of Segment Revenue 7.70% 8.70% 7.50% 8.30%  
Goodwill 70,946   70,946   70,946
West
          
Segment reporting information          
Revenue 224,391 258,194 458,417 465,880  
% of Segment Revenue 43.50% 58.00% 46.50% 54.40%  
Gross Profit 37,809 41,926 69,483 70,675  
% of Segment Revenue 16.90% 16.20% 15.20% 15.20%  
Goodwill 45,239   45,239   45,239
Engineering
          
Segment reporting information          
Revenue 12,834 11,421 25,810 23,519  
% of Segment Revenue 2.50% 2.60% 2.60% 2.80%  
Gross Profit 2,076 2,396 4,143 4,748  
% of Segment Revenue 16.20% 21.00% 16.10% 20.20%  
Goodwill $ 2,441   $ 2,441   $ 2,441