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Trade Accounts Receivable, Net | 3 Months Ended
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Mar. 31, 2018
Receivables [Abstract] |
Trade Accounts Receivable, Net | Trade Accounts Receivable, Net Trade accounts receivable at the dates indicated consisted of the following:
| At March 31, |  | At December 31,
(in thousands) | 2018 |  | 2017 |  | 2017
Trade accounts receivable | $ | 169,552 |  |  | $ | 153,542 |  |  | $ | 139,910 |
Allowance for doubtful accounts | (1,217 | ) |  | (1,284 | ) |  | (996 | )
Allowance for sales discounts and returns | (1,189 | ) |  | (3,752 | ) |  | (2,956 | )
| $ | 167,146 |  |  | $ | 148,506 |  |  | $ | 135,958 |
The decrease in allowance for sales discounts and returns is primarily related to the adoption of ASC 606 resulting in a $1.1 million adjustment in recognition of estimated right of returns assets on product sales and its corresponding estimated refund liability as of December 31, 2017, which was not recordable under previous revenue recognition guidance. This amount was estimated based upon the most likely amount of consideration to which the customer will be entitled. All estimates are based on historical experience, anticipated performance and the Company’s best judgment at the time to the extent it is probable that a significant reversal of revenue recognized will not occur. These estimates are reassessed periodically.

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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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