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Business Segments and Customer Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 691,790 | $ 533,982 | $ 424,071
Operating income | $ 13,286 | $ 13,623 | $ 11,879 | $ 12,741 | $ 15,116 | $ 13,243 | $ 11,496 | $ 10,684 | 51,529 | 50,539 | 36,930
Total assets | 661,839 |  |  |  | 617,354 |  |  |  | 661,839 | 617,354 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 691,790 | 533,982 | 424,071
Operating income |  |  |  |  |  |  |  |  | 51,529 | 50,539 | 36,930
Depreciation and amortization |  |  |  |  |  |  |  |  | 26,046 | 25,541 | 18,770
Capital expenditures |  |  |  |  |  |  |  |  | 7,372 | 10,562 | 3,414
Total assets | 661,839 |  |  |  | 617,354 |  |  |  | 661,839 | 617,354 |
Operating Segments | Supply Chain Management |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 205,475 | 196,772 | 172,482
Operating income |  |  |  |  |  |  |  |  | 34,632 | 35,453 | 29,694
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,445 | 7,074 | 5,373
Capital expenditures |  |  |  |  |  |  |  |  | 4,195 | 7,544 | 2,524
Total assets | 185,004 |  |  |  | 188,352 |  |  |  | 185,004 | 188,352 |
Operating Segments | Aviation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 133,466 | 119,729 | 0
Operating income |  |  |  |  |  |  |  |  | 12,823 | 10,635 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,461 | 5,865 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 1,459 | 959 | 0
Total assets | 291,500 |  |  |  | 263,226 |  |  |  | 291,500 | 263,226 |
Operating Segments | Federal Services Group |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 306,109 | 166,973 | 190,761
Operating income |  |  |  |  |  |  |  |  | 4,185 | 2,071 | 3,452
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,752 | 10,635 | 11,320
Capital expenditures |  |  |  |  |  |  |  |  | 85 | 78 | 230
Total assets | 60,506 |  |  |  | 38,772 |  |  |  | 60,506 | 38,772 |
Operating Segments | IT, Energy and Management Consulting |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 46,740 | 50,508 | 60,828
Operating income |  |  |  |  |  |  |  |  | 3,611 | 4,731 | 6,634
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,388 | 1,967 | 2,077
Capital expenditures |  |  |  |  |  |  |  |  | 9 | 16 | 199
Total assets | 47,043 |  |  |  | 47,000 |  |  |  | 47,043 | 47,000 |
Operating Segments | Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 77,786 |  |  |  | $ 80,004 |  |  |  | 77,786 | 80,004 |
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (3,722) | (2,351) | (2,850)
Capital expenditures |  |  |  |  |  |  |  |  | $ 1,624 | $ 1,965 | $ 461

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