Contract Balances (Tables)

6 Months Ended

Jun. 30, 2019

Contract Balances

Valuation and Qualifying 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 six months ended June 30, 2019	$	16,956	$	35,359	$	(34,240)	$	18,075

Schedule of Contract balances

	Contract
	Liabilities
	(In thousands)
Balance as of December 31, 2018	$	624,626
Recognition of unearned revenue		(4,128,842)
Deferral of revenue		4,137,995
Balance as of June 30, 2019	$	633,779