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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts

4. Valuation and Qualifying Accounts

 

     Balance at
Beginning of
Year		      Charged to
Expense		      Deductions(1)     Balance at
End of
Year		  

Allowance for doubtful accounts receivable:

           

Year ended December 31, 2014

    $ 9,678         15,045         (18,251 )    $ 6,472   

Year ended December 31, 2013

    $ 8,657         19,897         (18,876 )    $ 9,678   

Year ended December 31, 2012

    $ 11,706         18,012         (21,061 )    $ 8,657   

 

(1) Deductions represent accounts written off, net of recoveries.