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Contract Balances
 3 Months Ended
Mar. 31, 2019
Contract Balances  
Contract Balances

 

12.Contract Balances

 

Our valuation and qualifying accounts as of March 31, 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 three months ended March 31, 2019

 

$

16,966

 

$

18,496

 

$

(16,495)

 

$

18,967

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

(1,597,470)

Deferral of revenue

 

 

1,589,358

Balance as of March 31, 2019

 

$

626,906

 

 

 

 

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.