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Balance Sheet Components (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
Apr. 01, 2018
Jan. 01, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]      
Raw materials $ 3,982   $ 4,465
Work in process 3   0
Finished goods 262,360   241,429
Total inventories $ 266,345 $ 243,526 $ 245,894