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Revenue Recognition Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Distributor sales accruals [Line Items] |  |  |  |
Distributor sales accrual, Beginning Balance | $ 36,680 | $ 34,479 | $ 34,479 | $ 32,487
Distributor sales accrual, sales allowance | 24,188 | 21,520 | 89,009 | 86,896
Distributor sales accrual, credits issued | (28,450) | (23,471) | (87,403) | (85,341)
Distributor sales accrual, foreign currency | 288 | (576) | 595 | 437
Distributor sales accrual, Ending Balance | $ 32,706 | $ 31,952 | $ 36,680 | $ 34,479

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