| Business Segments and Customer Information | Our segment information for the three- and nine-months ended September 30, 2012 and 2011 is as follows (in thousands): 
 
|  |  | Three months |  |  | Nine months |  |  
|  |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |  |  
| Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  
|   Federal Group |  | $ | 34,643 |  |  | $ | 36,479 |  |  | $ | 98,340 |  |  | $ | 155,574 |  |  
|   International Group |  |  | 39,778 |  |  |  | 51,290 |  |  |  | 127,823 |  |  |  | 157,682 |  |  
|   IT, Energy and Management Consulting Group |  |  | 24,286 |  |  |  | 25,905 |  |  |  | 74,043 |  |  |  | 80,871 |  |  
|   Infrastructure Group |  |  | 14,010 |  |  |  | 9,815 |  |  |  | 21,857 |  |  |  | 28,476 |  |  
|   Supply Chain Management Group |  |  | 35,529 |  |  |  | 36,434 |  |  |  | 109,688 |  |  |  | 47,110 |  |  
|     Total revenues |  | $ | 148,246 |  |  | $ | 159,923 |  |  | $ | 431,751 |  |  | $ | 469,713 |  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| Operating income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   Federal Group |  | $ | 3,067 |  |  | $ | 1,153 |  |  | $ | 7,112 |  |  | $ | 5,914 |  |  
|   International Group |  |  | 1,317 |  |  |  | 222 |  |  |  | 4,152 |  |  |  | 3,938 |  |  
|   IT, Energy and Management Consulting Group |  |  | 4,405 |  |  |  | 3,079 |  |  |  | 10,353 |  |  |  | 9,206 |  |  
|   Infrastructure Group |  |  | (2,417 | ) |  |  | 159 |  |  |  | (3,087 | ) |  |  | 605 |  |  
|   Supply Chain Management Group |  |  | 6,151 |  |  |  | 6,896 |  |  |  | 18,536 |  |  |  | 8,823 |  |  
|   Corporate/unallocated expenses |  |  | (673 | ) |  |  | (122 | ) |  |  | (841 | ) |  |  | (2,917 | ) |  
|    Operating income |  | $ | 11,850 |  |  | $ | 11,387 |  |  | $ | 36,225 |  |  | $ | 25,569 |  |  |