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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

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