Contract Balances

6 Months Ended

Jun. 30, 2018

Contract Balances

Contract Balances

11.Contract Balances

Our valuation and qualifying accounts activity as of June 30, 2018 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 six months ended June 30, 2018	$	15,056	$	47,110	$	(50,620)	$	11,546

Deferred revenue related to contracts with subscribers 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 subscribers were as follows: 

	Contract
	Liabilities
	(In thousands)
Balance as of December 31, 2017	$	684,119
Recognition of unearned revenue		(3,669,340)
Deferral of revenue		3,669,999
Balance as of June 30, 2018	$	684,778

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.