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Accounts Receivable, Net | 6 Months Ended
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Jun. 30, 2018
Receivables [Abstract] |
Accounts Receivable, Net | Note 4. Accounts Receivable, Net Accounts receivable, net, at June 30, 2018 and December 31, 2017 were as follows (in thousands):
|  | June 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Trade accounts receivable |  | $ | 181,572 |  |  | $ | 139,730 |
Unbilled revenue, at net realizable value |  |  | 79,527 |  |  |  | 62,397 |
Total accounts receivable |  |  | 261,099 |  |  |  | 202,127 |
Allowance for doubtful accounts |  |  | (15,460 | ) |  |  | (13,827 | )
Accounts receivable, net |  | $ | 245,639 |  |  | $ | 188,300 |

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