Contract Balances

9 Months Ended

Sep. 30, 2019

Contract Balances

Contract Balances

12.Contract Balances

Our valuation and qualifying accounts as of September 30, 2019 were as follows:

Allowance for doubtful accounts	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions		Balance at End of Period
	(In thousands)
For the nine months ended September 30, 2019	$	16,966	$	59,783	$	(53,628)	$	23,121

Deferred revenue related to contracts with our customers is recorded in “Deferred revenue and other” and “Long-term deferred revenue and other long-term liabilities” on our Condensed Consolidated Balance Sheets. Changes in deferred revenue related to contracts with our customers were as follows:

	Contract
	Liabilities
	(In thousands)
Balance as of December 31, 2018	$	635,018
Recognition of unearned revenue		(5,714,007)
Deferral of revenue		5,715,398
Balance as of September 30, 2019	$	636,409

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.