Quarterly report pursuant to Section 13 or 15(d)

Business Segments and Customer Information - Segment Information (Details)

v3.10.0.1
Business Segments and Customer Information - Segment Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Segment Reporting [Abstract]        
Number of reportable operating segments | segment     3  
Segment Reporting Information [Line Items]        
Revenues $ 170,394 $ 193,860 $ 347,291 $ 391,154
Operating income 13,855 15,005 25,448 29,201
Supply Chain Management Group        
Segment Reporting Information [Line Items]        
Revenues 54,263   110,127  
Aviation Group        
Segment Reporting Information [Line Items]        
Revenues 35,804   68,554  
Federal Services Group        
Segment Reporting Information [Line Items]        
Revenues 80,327   168,610  
Operating Segments | Supply Chain Management Group        
Segment Reporting Information [Line Items]        
Revenues 54,263 56,404 110,127 112,489
Operating income 8,168 8,950 15,764 17,433
Operating Segments | Aviation Group        
Segment Reporting Information [Line Items]        
Revenues 35,804 32,590 68,554 64,944
Operating income 2,846 2,579 5,107 4,915
Operating Segments | Federal Services Group        
Segment Reporting Information [Line Items]        
Revenues 80,327 104,866 168,610 213,721
Operating income 3,606 3,992 6,084 7,910
Corporate/unallocated expenses        
Segment Reporting Information [Line Items]        
Operating income $ (765) $ (516) $ (1,507) $ (1,057)