Contract Balances (Tables)

3 Months Ended

Mar. 31, 2019

Contract Balances

Summary of activity in the allowance for doubtful accounts

Allowance for doubtful accounts	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions		Balance at End of Period
	(In thousands)
For the three months ended March 31, 2019	$	16,966	$	18,496	$	(16,495)	$	18,967

Schedule of changes in deferred revenue related to contracts with subscribers

	Contract
	Liabilities
	(In thousands)
Balance as of December 31, 2018	$	635,018
Recognition of unearned revenue		(1,597,470)
Deferral of revenue		1,589,358
Balance as of March 31, 2019	$	626,906