Contract Balances (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 19,280
Current Period Provision For Expected Credit Losses	56,398
Write-offs Charged Against Allowance	(41,313)
Balance at End of Period	34,365
Balance at Beginning of Period	609,054
Recognition of unearned revenue	(4,369,230)
Deferral of revenue	4,365,480
Balance at End of Period	$ 605,304
Remaining performance obligations	true