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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014

 

$
15,981

 

$
151,016

 

$
(143,477

)

$
23,520

 

December 31, 2013

 

$
13,834

 

$
125,664

 

$
(123,517

)

$
15,981

 

December 31, 2012

 

$
11,916

 

$
116,742

 

$
(114,824

)

$
13,834