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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts  
Summary of activity in the allowance for doubtful accounts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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, 2016

 

$
20,972

 

$
149,603

 

$
(153,579)

 

$
16,996

 

December 31, 2015

 

$
23,520

 

$
94,205

 

$
(96,753)

 

$
20,972

 

December 31, 2014

 

$
15,981

 

$
151,016

 

$
(143,477)

 

$
23,520