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Allowance for Doubtful Accounts
 6 Months Ended
Jun. 30, 2017
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		  

Six months ended June 30, 2017

    $ 5,918        7,830        (8,179 )    $ 5,569  

Six months ended June 30, 2016

    $ 5,137        7,963        (7,525 )    $ 5,575  

 

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