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Prepaid Expenses and Other Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Prepaid Expenses and Other Assets | Prepaid expenses and other assets consist of the following as of December 31 (in thousands):
|  | 2018 |  |  | 2017 |
Revenues in excess of billings |  | $ | 7,987 |  |  | $ | 4,841 |
Prepaid expenses |  |  | 3,390 |  |  |  | 7,494 |
Contract retainage |  |  | 2,469 |  |  |  | 1,449 |
Income tax receivable |  |  | 471 |  |  |  | 2,230 |
Other |  |  | 1,245 |  |  |  | 864 |
Total prepaid expenses and other assets |  | $ | 15,562 |  |  | $ | 16,878 |

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