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Accounts Receivable, Net (Tables) | 3 Months Ended
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Mar. 31, 2019
Receivables [Abstract] |
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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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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