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Business Segments and Customer Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 195,271 | $ 198,326 | $ 189,111 | $ 169,919 | $ 180,996 | $ 168,931 | $ 170,394 | $ 176,897 | $ 752,627 | $ 697,218 | $ 760,113
Operating income | 14,813 | $ 17,215 | $ 16,416 | $ 11,813 | 13,085 | $ 15,697 | $ 13,855 | $ 11,593 | 60,257 | 54,230 | 54,325
Total assets | 845,864 |  |  |  | 638,828 |  |  |  | 845,864 | 638,828 |
Supply Chain Management |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 214,520 | 214,809 |
Aviation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 224,546 | 145,423 |
Federal Services Group |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 313,561 | 336,986 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 752,627 | 697,218 | 760,113
Operating income |  |  |  |  |  |  |  |  | 60,257 | 54,230 | 54,325
Depreciation and amortization |  |  |  |  |  |  |  |  | 26,927 | 25,224 | 25,882
Capital expenditures |  |  |  |  |  |  |  |  | 9,660 | 3,117 | 3,313
Total assets | 845,864 |  |  |  | 638,828 |  |  |  | 845,864 | 638,828 |
Operating Segments | Supply Chain Management |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 214,520 | 214,809 | 214,542
Operating income |  |  |  |  |  |  |  |  | 29,819 | 30,626 | 33,754
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,085 | 7,299 | 6,536
Capital expenditures |  |  |  |  |  |  |  |  | 1,076 | 802 | 1,376
Total assets | 170,142 |  |  |  | 166,015 |  |  |  | 170,142 | 166,015 |
Operating Segments | Aviation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 224,546 | 145,423 | 134,809
Operating income |  |  |  |  |  |  |  |  | 17,901 | 11,076 | 9,695
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,546 | 5,123 | 4,835
Capital expenditures |  |  |  |  |  |  |  |  | 8,396 | 1,772 | 1,387
Total assets | 522,446 |  |  |  | 316,197 |  |  |  | 522,446 | 316,197 |
Operating Segments | Federal Services Group |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 313,561 | 336,986 | 410,762
Operating income |  |  |  |  |  |  |  |  | 18,144 | 15,797 | 13,419
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,296 | 12,802 | 14,511
Capital expenditures |  |  |  |  |  |  |  |  | 58 | 209 | 177
Total assets | 88,966 |  |  |  | 92,098 |  |  |  | 88,966 | 92,098 |
Operating Segments | Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 64,310 |  |  |  | $ 64,518 |  |  |  | 64,310 | 64,518 |
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (5,607) | (3,269) | (2,543)
Capital expenditures |  |  |  |  |  |  |  |  | $ 130 | $ 334 | $ 373

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