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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

 

$

15,511

 

$

47,274

 

$

(51,197)

 

$

11,588

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

$

699,597

Recognition of unearned revenue

 

 

(3,700,172)

Deferral of revenue

 

 

3,698,095

Balance as of June 30, 2018

 

$

697,520

 

 

 

 

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.