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v3.19.1

Trade Accounts Receivable, Net | 3 Months Ended
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Mar. 31, 2019
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) | 2019 |  | 2018 |  | 2018
Trade accounts receivable | $ | 176,896 |  |  | $ | 169,552 |  |  | $ | 149,886 |
Allowance for doubtful accounts | (1,195 | ) |  | (1,217 | ) |  | (1,364 | )
Allowance for sales discounts and returns | (2,561 | ) |  | (1,189 | ) |  | (2,470 | )
| $ | 173,140 |  |  | $ | 167,146 |  |  | $ | 146,052 |

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