| Segment Information | 
Our segment information for the three months ended March 31, 2015 and 2014 is as follows (in thousands): 
 
|  |  | Three Months |  |  
|  |  | ended March 31, |  |  
|  |  | 2015 |  |  | 2014 |  |  
| Revenues: |  |  |  |  |  |  |  
|   Supply Chain Management Group |  | $ | 46,242 |  |  | $ | 40,623 |  |  
|   Aviation Group |  |  | 22,764 |  |  |  | - |  |  
|   Federal Services Group |  |  | 37,792 |  |  |  | 63,270 |  |  
|   IT, Energy and Management Consulting Group |  |  | 13,993 |  |  |  | 15,516 |  |  
|     Total revenues |  | $ | 120,791 |  |  | $ | 119,409 |  |  
|  |  |  |  |  |  |  |  |  |  
| Operating income: |  |  |  |  |  |  |  |  |  
|   Supply Chain Management Group |  | $ | 8,306 |  |  | $ | 7,821 |  |  
|   Aviation Group |  |  | 2,113 |  |  |  | - |  |  
|   Federal Services Group |  |  | (267 | ) |  |  | 2,718 |  |  
| 
  IT, Energy and Management Consulting Group |  |  | 1,215 |  |  |  | 1,453 |  |  
|   Corporate/unallocated expenses |  |  | (683 | ) |  |  | (635 | ) |  
|    Operating income |  | $ | 10,684 |  |  | $ | 11,357 |  |  
|  |  | March 31, |  |  | December 31, |  |  
|  |  | 2015 |  |  | 2014 |  |  
| Total assets: |  |  |  |  |  |  |  
|   Supply Chain Management Group |  | $ | 216,098 |  |  | $ | 192,720 |  |  
|   Aviation Group |  |  | 277,844 |  |  |  | - |  |  
|   Federal Services Group |  |  | 38,050 |  |  |  | 36,225 |  |  
| 
  IT, Energy and Management Consulting Group |  |  | 24,722 |  |  |  | 49,790 |  |  
|   Corporate/unallocated expenses |  |  | 86,756 |  |  |  | 76,595 |  |  
|    Total assets |  | $ | 643,470 |  |  | $ | 355,330 |  |  | 
      
        | Revenue by Customer | 
Our revenue by customer is as follows (in thousands): 
 
|  |  | Three Months |  |  
|  |  | ended March 31, |  |  
|  |  | 2015 |  |  | % |  |  | 2014 |  |  | % |  |  
| Source of Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  
| U.S. Navy |  | $ | 21,397 |  |  |  | 17.7 |  |  | $ | 24,614 |  |  |  | 20.6 |  |  
| Army/Army Reserve |  |  | 19,171 |  |  |  | 15.9 |  |  |  | 33,698 |  |  |  | 28.2 |  |  
| U.S. Air Force |  |  | 790 |  |  |  | 0.7 |  |  |  | 796 |  |  |  | 0.7 |  |  
| Total - DoD |  |  | 41,358 |  |  |  | 34.3 |  |  |  | 59,108 |  |  |  | 49.5 |  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| U.S. Postal Service |  |  | 44,180 |  |  |  | 36.6 |  |  |  | 39,329 |  |  |  | 32.9 |  |  
| Department of Energy |  |  | 4,444 |  |  |  | 3.7 |  |  |  | 4,626 |  |  |  | 3.9 |  |  
| Department of Treasury |  |  | 415 |  |  |  | 0.3 |  |  |  | 8,358 |  |  |  | 7.0 |  |  
| Other government |  |  | 6,423 |  |  |  | 5.3 |  |  |  | 7,179 |  |  |  | 6.0 |  |  
| Total – Federal civilian agencies |  |  | 55,462 |  |  |  | 45.9 |  |  |  | 59,492 |  |  |  | 49.8 |  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| Commercial |  |  | 23,971 |  |  |  | 19.8 |  |  |  | 809 |  |  |  | 0.7 |  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| Total |  | $ | 120,791 |  |  |  | 100.0 |  |  | $ | 119,409 |  |  |  | 100.0 |  |  |