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Revenue Recognition Policies (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue Recognition Policies |
Schedule of Loss Contingencies by Contingency [Table Text Block] | Distributor sales accrual activity is shown below:
|  | Fiscal quarters ended |  |  | Years Ended December 31, |
|  | March 31, 2018 |  |  | April 1, 2017 |  |  | 2017 |  |  | 2016 |
Beginning balance |  | $ | 36,680 |  |  | $ | 34,479 |  |  | $ | 34,479 |  |  | $ | 32,487 |
Sales allowances |  |  | 24,188 |  |  |  | 21,520 |  |  |  | 89,009 |  |  |  | 86,896 |
Credits issued |  |  | (28,450 | ) |  |  | (23,471 | ) |  |  | (87,403 | ) |  |  | (85,341 | )
Foreign currency |  |  | 288 |  |  |  | (576 | ) |  |  | 595 |  |  |  | 437 |
Ending balance |  | $ | 32,706 |  |  | $ | 31,952 |  |  | $ | 36,680 |  |  | $ | 34,479 |

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