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RECEIVABLES (Tables) | 12 Months Ended
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Dec. 31, 2018
Receivables [Abstract] |
Summary of Accounts Receivable | A summary of accounts receivable as of December 31, 2018 and 2017 is as follows (in thousands):
| December 31,
| 2018 |  | 2017
Trade accounts receivable | $ | 207,266 |  |  | $ | 244,133 |
Unbilled revenues | 76,268 |  |  | 69,138 |
Allowance for doubtful accounts | (15,182 | ) |  | (11,308 | )
Total | $ | 268,352 |  |  | $ | 301,963 |
Summary of Activity in Allowance for Doubtful Accounts | The following summarizes the activity in the allowance for doubtful accounts (in thousands):
| Twelve Months Ended December 31,
| 2018 |  | 2017 |  | 2016
Balance at beginning of period | $ | 11,308 |  |  | $ | 7,835 |  |  | $ | 3,548 |
Provision for doubtful accounts | 11,662 |  |  | 7,097 |  |  | 6,336 |
Write-off of bad debts | (7,788 | ) |  | (3,624 | ) |  | (2,049 | )
Balance at end of period | $ | 15,182 |  |  | $ | 11,308 |  |  | $ | 7,835 |

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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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