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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

 

$
22,167

 

$
153,796

 

$
(158,008)

 

$
17,955

 

December 31, 2015

 

$
23,603

 

$
104,926

 

$
(106,362)

 

$
22,167

 

December 31, 2014

 

$
15,981

 

$
156,318

 

$
(148,696)

 

$
23,603