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Balance Sheet Components (Schedule of Other Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]      
Current operating lease liabilities $ 10,243   $ 0
Sales and marketing 73,081   91,548
Warranty obligations 11,913   14,412
Sales returns 42,221   46,318
Freight and duty 5,136   10,586
Other 29,279   36,608
Total other accrued liabilities $ 171,873 $ 210,381 $ 199,472