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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts  
Valuation and Qualifying Accounts

14.Valuation and Qualifying Accounts

 

Our valuation and qualifying accounts as of December 31, 2017, 2016 and 2015 were as follows:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Allowance for doubtful accounts

    

Balance at Beginning of Year

    

Charged to Costs and Expenses

    

Deductions

    

Balance at End of Year

  

 

 

(In thousands)

 

For the years ended:

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2017

 

$

17,440

 

$

124,143

 

$

(126,527)

 

$

15,056

 

December 31, 2016

 

$

21,769

 

$

149,599

 

$

(153,928)

 

$

17,440

 

December 31, 2015

 

$

25,414

 

$

94,186

 

$

(97,831)

 

$

21,769