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Revenue Recognition Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue Recognition Policies |
Schedule of Loss Contingencies by Contingency [Table Text Block] | Distributor sales accrual activity is shown below:
|  | Fiscal quarters ended |  |  | Six fiscal months ended |  |  | Years Ended December 31, |
|  | June 30, 2018 |  |  | July 1, 2017 |  |  | June 30, 2018 |  |  | July 1, 2017 |  |  | 2017 |  |  | 2016 |
Beginning balance |  | $ | 32,706 |  |  | $ | 31,952 |  |  | $ | 36,680 |  |  | $ | 34,479 |  |  | $ | 34,479 |  |  | $ | 32,487 |
Sales allowances |  |  | 25,365 |  |  |  | 23,250 |  |  |  | 49,553 |  |  |  | 44,770 |  |  |  | 89,009 |  |  |  | 86,896 |
Credits issued |  |  | (19,348 | ) |  |  | (20,051 | ) |  |  | (47,798 | ) |  |  | (43,522 | ) |  |  | (87,403 | ) |  |  | (85,341 | )
Foreign currency |  |  | (691 | ) |  |  | 582 |  |  |  | (403 | ) |  |  | 6 |  |  |  | 595 |  |  |  | 437 |
Ending balance |  | $ | 38,032 |  |  | $ | 35,733 |  |  | $ | 38,032 |  |  | $ | 35,733 |  |  | $ | 36,680 |  |  | $ | 34,479 |

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