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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts

Schedule II

Valuation and Qualifying Accounts

 

(in thousands)

    Balance
at
beginning
of period		      Charged
to revenue
and
expenses		      Charged to
(from) other
accounts		      Deductions     Balance at
end of
period		  

Year Ended December 31, 2017

              

Allowance for bad debts and sales-related allowances

    $ 23,330      $ 12,416      $  —        $ (3,410 )    $ 32,336  

Year Ended December 31, 2016

              

Allowance for bad debts and sales-related allowances

      21,993        10,678      $ —          (9,341 )      23,330  

Year Ended December 31, 2015

              

Allowance for bad debts and sales-related allowances

      17,517        7,536        —          (3,060 )      21,993