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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015

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

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   

 

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