Contract Balances (Details) $ in Thousands	6 Months Ended
	Jun. 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	51,808
Write-offs Charged Against Allowance	(29,900)
Balance at End of Period	41,188
Balance at Beginning of Period	609,054
Recognition of unearned revenue	(2,951,822)
Deferral of revenue	2,925,648
Balance at End of Period	$ 582,880
Remaining performance obligations	true