Contract Balances

12 Months Ended

Dec. 31, 2022

Contract Balances

Contract Balances

17.    Contract Balances

Our valuation and qualifying accounts as of December 31, 2022, 2021 and 2020 were as follows:

Allowance for credit losses	Balance at Beginning of Period		Current Period Provision for Expected Credit Losses		Write-offs Charged Against Allowance			Acquisitions	Balance at End of Period
	(In thousands)
For the years ended:
December 31, 2022	$	38,534	$	79,664	$	(73,845)	$	78	$	44,431
December 31, 2021	$	72,278	$	54,083	$	(87,919)	$	92	$	38,534
December 31, 2020	$	19,280	$	84,697	$	(56,075)	$	24,376	$	72,278

Contract liabilities arise when we bill our customers and receive consideration in advance of providing the service. Contract liabilities are recognized as revenue when the service has been provided to the customer. Contract liabilities are recorded in “Deferred revenue and other” and “Long-term deferred revenue and other long-term liabilities” on our Consolidated Balance Sheets.

	As of
	December 31,		December 31,
	2022		2021
	(In thousands)
Contract liabilities	$	698,602	$	714,428

Our beginning of period contract liability recorded as customer contract revenue during 2022 was $711 million.

We apply a practical expedient and do not disclose the value of the remaining performance obligations for contracts that are less than one year in duration, which represent a substantial majority of our revenue. As such, the amount of revenue related to unsatisfied performance obligations is not necessarily indicative of our future revenue.