Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Balance Sheet Components [Abstract]
Inventory deposit	$ 31,957	$ 60,315
Prepaid income taxes	14,583	17,383
Other current assets	126,190	79,140
Other prepaid expenses and deposits	13,927	11,846
Total prepaid expenses and other current assets	$ 186,657	$ 168,684