Contract Balances (Tables)

3 Months Ended

Mar. 31, 2021

Contract Balances

Summary of activity in the allowance for doubtful accounts

Allowance for credit losses	Balance at Beginning of Period		Current Period Provision for Expected Credit Losses		Write-offs Charged Against Allowance		Balance at End of Period
	(In thousands)
For the three months ended March 31, 2021	$	72,278	$	11,168	$	(26,821)	$	56,625

Schedule of changes in deferred revenue related to contracts with subscribers

	Contract
	Liabilities
	(In thousands)
Balance as of December 31, 2020	$	778,832
Recognition of unearned revenue		(3,050,520)
Deferral of revenue		3,059,704
Balance as of March 31, 2021	$	788,016