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Schedule II Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II – Valuation and Qualifying Accounts
 
The table below details the activity of the allowance for doubtful accounts and sales credits (1) for the years ended December 31, 2019, 2018, and 2017 (in thousands):
 
 
Balance at
Beginning
of Year
 
Charged to
Expense
 
Reductions
 
Balance at
End of Year
Year ended December 31, 2017
 
$
6,344

 
$
5,690

 
$
5,565

 
$
6,469

Year ended December 31, 2018
 
$
6,469

 
$
6,542

 
$
7,302

 
$
5,709

Year ended December 31, 2019
 
$
5,709

 
$
10,978

 
$
11,590

 
$
5,097

__________________________
 
 
 
 
 
 
 
 
(1) 
Additions to the allowance for doubtful accounts are charged to bad debt expense. Additions to the allowance for sales credits are charged against revenues.