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Accounts Receivable, Net | 12 Months Ended
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Dec. 31, 2015
Receivables [Abstract] |
Accounts Receivable, Net | 2. Accounts Receivable, Net Accounts receivable, net balances at December 31, 2015 and 2014 were as follows (in thousands
|  | 2015 |  |  | 2014 |
Trade accounts receivable |  | $ | 118,916 |  |  | $ | 107,174 |
Unbilled revenue, at net realizable value |  |  | 47,351 |  |  |  | 47,789 |
Total accounts receivable |  |  | 166,267 |  |  |  | 154,963 |
Allowance for doubtful accounts |  |  | (12,659 | ) |  |  | (11,915 | )
Accounts receivable, net |  | $ | 153,608 |  |  | $ | 143,048 |
Changes in the allowance for doubtful accounts on accounts receivable are as follows (in thousands):
|  | 2015 |  |  | 2014 |  |  | 2013 |
Balance at beginning of period |  | $ | (11,915 | ) |  | $ | (9,975 | ) |  | $ | (11,363 | )
Provision for losses |  |  | (5,804 | ) |  |  | (5,740 | ) |  |  | (4,664 | )
Charge-offs, net of recoveries |  |  | 5,060 |  |  |  | 3,800 |  |  |  | 6,052 |
Balance at end of period |  | $ | (12,659 | ) |  | $ | (11,915 | ) |  | $ | (9,975 | )

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5162-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 + Details
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