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RECEIVABLES | 12 Months Ended
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Dec. 31, 2018
Receivables [Abstract] |
RECEIVABLES | RECEIVABLES 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 |
The allowance for doubtful accounts is our best estimate of the amount of probable credit losses in our existing accounts receivable. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is remote. 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 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: 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(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 6: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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