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Accounts Receivable, Net (Tables) | 12 Months Ended
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Dec. 31, 2016
Receivables [Abstract] |
Accounts Receivable, Net | Accounts receivable, net balances at December 31, 2016 and 2015 were as follows (in thousands):
|  | 2016 |  |  | 2015 |
Trade accounts receivable |  | $ | 132,880 |  |  | $ | 118,916 |
Unbilled revenue, at net realizable value |  |  | 55,982 |  |  |  | 47,351 |
Total accounts receivable |  |  | 188,862 |  |  |  | 166,267 |
Allowance for doubtful accounts |  |  | (13,508 | ) |  |  | (12,659 | )
Accounts receivable, net |  | $ | 175,354 |  |  | $ | 153,608 |
Schedule of Changes in the Allowance for Doubtful Accounts on Accounts Receivable | Changes in the allowance for doubtful accounts on accounts receivable are as follows (in thousands):
|  | 2016 |  |  | 2015 |  |  | 2014 |
Balance at beginning of period |  | $ | (12,659 | ) |  | $ | (11,915 | ) |  | $ | (9,975 | )
Provision for losses |  |  | (4,154 | ) |  |  | (5,804 | ) |  |  | (5,740 | )
Charge-offs, net of recoveries |  |  | 3,305 |  |  |  | 5,060 |  |  |  | 3,800 |
Balance at end of period |  | $ | (13,508 | ) |  | $ | (12,659 | ) |  | $ | (11,915 | )

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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://www.xbrl.org/2003/role/presentationRef -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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