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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | A summary of revenues for our operating groups by customer for the year ended December 31, 2018 is as follows (in thousands):
Customer |  | Supply Chain Management |  | Aviation |  | Federal Services |  | Total
USPS |  | $ | 175,339 |  |  | $ | — |  |  | $ | — |  |  | $ | 175,339 |
DoD |  | 24,280 |  |  | 7,387 |  |  | 302,827 |  |  | 334,494 |
Commercial |  | 14,329 |  |  | 135,864 |  |  | 413 |  |  | 150,606 |
Other government |  | 861 |  |  | 2,172 |  |  | 33,746 |  |  | 36,779 |
|  | $ | 214,809 |  |  | $ | 145,423 |  |  | $ | 336,986 |  |  | $ | 697,218 |
A summary of revenues for our operating groups by contract type for the year ended December 31, 2018 is as follows (in thousands):
Contract Type |  | Supply Chain Management |  | Aviation |  | Federal Services |  | Total
Cost-type |  | $ | — |  |  | $ | 4,863 |  |  | $ | 188,867 |  |  | $ | 193,730 |
Fixed-price |  | 214,809 |  |  | 84,600 |  |  | 70,669 |  |  | 370,078 |
Time and materials |  | — |  |  | 55,960 |  |  | 77,450 |  |  | 133,410 |
Total revenues |  | $ | 214,809 |  |  | $ | 145,423 |  |  | $ | 336,986 |  |  | $ | 697,218 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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