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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Schedule of 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, 2016

    $ 5,137         18,639         (17,858 )     $ 5,918   

Year ended December 31, 2015

    $ 6,472         16,620         (17,955 )     $ 5,137   

Year ended December 31, 2014

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

 

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