Contract Balances (Tables)

9 Months Ended

Sep. 30, 2021

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 nine months ended September 30, 2021	$	43,233	$	32,224	$	(39,457)	$	36,000

Schedule of Contract balances

	As of
	September 30,		December 31,
	2021		2020
	(In thousands)
Contract liabilities	$	556,895	$	593,797