Contract Balances (Tables)

3 Months Ended

Mar. 31, 2020

Contract Balances

Valuation and Qualifying 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, 2020	$	19,280	$	39,510	$	(19,984)	$	38,806

Schedule of Contract balances

	Contract
	Liabilities
	(In thousands)
Balance as of December 31, 2019	$	609,054
Recognition of unearned revenue		(1,488,531)
Deferral of revenue		1,479,875
Balance as of March 31, 2020	$	600,398