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Accounts Receivable, Net | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Accounts Receivable, Net | Note 2. Accounts Receivable, Net Accounts receivable, net balances at December 31, 2017 and 2016 were as follows (in thousands):
|  | 2017 |  |  | 2016 |
Trade accounts receivable |  | $ | 139,730 |  |  | $ | 132,880 |
Unbilled revenue, at net realizable value |  |  | 62,397 |  |  |  | 55,982 |
Total accounts receivable |  |  | 202,127 |  |  |  | 188,862 |
Allowance for doubtful accounts |  |  | (13,827 | ) |  |  | (13,508 | )
Accounts receivable, net |  | $ | 188,300 |  |  | $ | 175,354 |
Changes in the allowance for doubtful accounts on accounts receivable are as follows (in thousands):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Balance at beginning of period |  | $ | (13,508 | ) |  | $ | (12,659 | ) |  | $ | (11,915 | )
Provision for losses |  |  | (5,529 | ) |  |  | (4,154 | ) |  |  | (5,804 | )
Charge-offs, net of recoveries |  |  | 5,210 |  |  |  | 3,305 |  |  |  | 5,060 |
Balance at end of period |  | $ | (13,827 | ) |  | $ | (13,508 | ) |  | $ | (12,659 | )

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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=84173941&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(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 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 4: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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=84173941&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: 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=84173941&loc=d3e5074-111524 + Details
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