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Customers
 12 Months Ended
Dec. 31, 2011
Customers [Abstract]  
Customers
16.  Customers
 
The following table shows contract revenues generated from the Company's customers that accounted for more than 10% of revenues (dollars in thousands):
 
 
Years Ended December 31,
 
 
2011
 
2010
 
2009
 
 
Amount
  
%
 
Amount
  
%
 
Amount
  
%
 
Texas Department of Transportation (“TxDOT”)
 $75,818   15.1 % $95,198   20.7 % $81,599   20.9. %
Utah Department of Transportation (“UDOT”)
  144,398   28.8   120,492   26.2   *   * 
Nevada Department of Transportation (“NDOT”)
  *       *       92,137   23.6 
North Texas Tollway Authority (“NTTA”)
  *       *       52,183   13.4 
*Represents less than 10% of revenues
 
At December 31, 2011, UDOT owed $8.8 million to the Company, which amount is greater than 10% of contract receivables.  At December 31, 2010, TxDOT ($10.8 million), UDOT ($10.1 million), and the Utah Transit Authority ($9.6 million) each owed balances to the Company greater than 10% of contract receivables.