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Allowance for Doubtful Accounts
 3 Months Ended
Mar. 31, 2016
Receivables [Abstract]  
Allowance for Doubtful Accounts

5. Allowance for Doubtful Accounts

 

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

Three months ended March 31, 2016

    $ 5,137         4,520         (3,090 )     $ 6,567   

Three months ended March 31, 2015

    $ 6,472         3,968         (3,492 )     $ 6,948   

 

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