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Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2015
Schedule of Accounts Receivable | Accounts receivable (in thousands) consisted of the following, as of:
|  | December 31, |
|  | 2015 |  |  | 2014 |
Billed and billable |  | $ | 175,382 |  |  | $ | 187,470 |
Less: unpaid deferred revenue |  |  | (103,403 | ) |  |  | (104,425 | )
Accounts receivable, gross |  |  | 71,979 |  |  |  | 83,045 |
Less: allowance for doubtful accounts |  |  | (3,825 | ) |  |  | (4,412 | )
Accounts receivable, net |  | $ | 68,154 |  |  | $ | 78,633 |

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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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