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v3.19.1

Accounts Receivable, Net | 3 Months Ended
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Mar. 31, 2019
Receivables [Abstract] |
Accounts Receivable, Net | Note 4. Accounts Receivable, Net Accounts receivable, net balances at March 31, 2019 and December 31, 2018 were as follows (in thousands):
|  | March 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Trade accounts receivable |  | $ | 167,624 |  |  | $ | 159,992 |
Unbilled revenue |  |  | 109,384 |  |  |  | 60,684 |
Total accounts receivable |  |  | 277,008 |  |  |  | 220,676 |
Allowance for doubtful accounts |  |  | (12,574 | ) |  |  | (13,389 | )
Accounts receivable, net |  | $ | 264,434 |  |  | $ | 207,287 |

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