Quarterly report pursuant to Section 13 or 15(d)

Business Segments and Customer Information (Details)

v3.8.0.1
Business Segments and Customer Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]        
Number of reportable operating segments | segment     3  
Segment Reporting Information [Line Items]        
Revenues $ 174,164 $ 172,780 $ 565,318 $ 476,889
Operating income 12,237 13,623 41,438 38,243
Operating Segments | Supply Chain Management Group        
Segment Reporting Information [Line Items]        
Revenues 51,174 51,152 163,663 152,080
Operating income 8,178 8,749 25,611 26,600
Operating Segments | Aviation        
Segment Reporting Information [Line Items]        
Revenues 31,059 34,688 96,003 100,298
Operating income 1,983 3,950 6,898 9,896
Operating Segments | Federal Services Group        
Segment Reporting Information [Line Items]        
Revenues 91,931 86,940 305,652 224,511
Operating income 2,593 1,650 10,503 5,041
Corporate, Non-Segment        
Segment Reporting Information [Line Items]        
Operating income $ (517) $ (726) $ (1,574) $ (3,294)