Annual report pursuant to Section 13 and 15(d)

Business Segments and Customer Information (Details)

v3.10.0.1
Business Segments and Customer Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Revenues $ 180,996 $ 168,931 $ 170,394 $ 176,897 $ 194,795 $ 174,164 $ 193,860 $ 197,294 $ 697,218 $ 760,113 $ 691,790
Operating income 13,085 $ 15,697 $ 13,855 $ 11,593 12,887 $ 12,237 $ 15,005 $ 14,196 54,230 54,325 51,529
Total assets 638,828       629,013       638,828 629,013  
Supply Chain Management                      
Segment Reporting Information [Line Items]                      
Revenues                 214,809    
Aviation                      
Segment Reporting Information [Line Items]                      
Revenues                 145,423    
Federal Services Group                      
Segment Reporting Information [Line Items]                      
Revenues                 336,986    
Operating Segments                      
Segment Reporting Information [Line Items]                      
Revenues                 697,218 760,113 691,790
Operating income                 54,230 54,325 51,529
Depreciation and amortization                 25,224 25,882 26,046
Capital expenditures                 3,117 3,313 7,372
Total assets 638,828       629,013       638,828 629,013  
Operating Segments | Supply Chain Management                      
Segment Reporting Information [Line Items]                      
Revenues                 214,809 214,542 205,475
Operating income                 30,626 33,754 34,632
Depreciation and amortization                 7,299 6,536 6,445
Capital expenditures                 802 1,376 4,195
Total assets 166,015       176,860       166,015 176,860  
Operating Segments | Aviation                      
Segment Reporting Information [Line Items]                      
Revenues                 145,423 134,809 133,466
Operating income                 11,076 9,695 12,823
Depreciation and amortization                 5,123 4,835 5,461
Capital expenditures                 1,772 1,387 1,459
Total assets 316,197       282,738       316,197 282,738  
Operating Segments | Federal Services Group                      
Segment Reporting Information [Line Items]                      
Revenues                 336,986 410,762 352,849
Operating income                 15,797 13,419 7,796
Depreciation and amortization                 12,802 14,511 14,140
Capital expenditures                 209 177 94
Total assets 92,098       102,372       92,098 102,372  
Operating Segments | Corporate                      
Segment Reporting Information [Line Items]                      
Total assets $ 64,518       $ 67,043       64,518 67,043  
Corporate, Non-Segment                      
Segment Reporting Information [Line Items]                      
Operating income                 (3,269) (2,543) (3,722)
Capital expenditures                 $ 334 $ 373 $ 1,624