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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts  
Summary of activity in the allowance for doubtful accounts

 

 

 

 

Balance at

 

Charged to

 

 

 

Balance at

 

 

 

Beginning

 

Costs and

 

 

 

End of

 

Allowance for doubtful accounts

 

of Year

 

Expenses

 

Deductions

 

Year

 

 

 

(In thousands)

 

For the years ended:

 

 

 

 

 

 

 

 

 

December 31, 2012

 

$

15,773

 

$

124,610

 

$

(123,438

)

$

16,945

 

December 31, 2011

 

$

29,650

 

$

100,321

 

$

(114,198

)

$

15,773

 

December 31, 2010

 

$

16,372

 

$

115,478

 

$

(102,200

)

$

29,650