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

16.    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

 

$

18,399

 

$

124,126

 

$

(127,014)

 

$

15,511

 

December 31, 2016

 

$

22,965

 

$

153,792

 

$

(158,358)

 

$

18,399

 

December 31, 2015

 

$

25,497

 

$

104,907

 

$

(107,439)

 

$

22,965