Contract Balances (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 19,280
Current Period Provision For Expected Credit Losses	39,510
Write-offs Charged Against Allowance	(19,984)
Balance at End of Period	38,806
Balance at Beginning of Period	609,054
Recognition of unearned revenue	(1,488,531)
Deferral of revenue	1,479,875
Balance at End of Period	$ 600,398
Remaining performance obligations	true