Balance Sheet Components - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balances	$ 104,001	$ 109,872	$ 98,851
Increases	178,962	170,957	229,610
Write-offs	(181,637)	(176,828)	(218,589)
Ending balances	$ 101,326	$ 104,001	$ 109,872