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Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Distributor sales accruals [Line Items] |  |  |
Beginning Balance | $ 36,680 | $ 34,479 | $ 32,487
Sales allowances | 102,026 | 89,009 | 86,896
Credits issued | (95,521) | (87,403) | (85,341)
Foreign currency | (522) | 595 | 437
Ending Balance | $ 42,663 | $ 36,680 | $ 34,479

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