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Valuation and Qualifying Accounts (Tables)
12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule of valuation and qualifying accounts
(in thousands)
 
Balance at Beginning of Year
 
Charged to Income
 
Deductions from Reserves(1)
 
Other Adjustments
 
Balance at End of Year
Allowance for doubtful accounts
Year ended December 31, 2019
 
$
1,119

 
$
146

 
$
(323
)
 
$

 
$
942

Year ended December 31, 2018
 
$
977

 
$
321

 
$
(179
)
 
$

 
$
1,119

Year ended December 31, 2017
 
$
969

 
$
136

 
$
(128
)
 
$

 
$
977

 
 
 
 
 
 
 
 
 
 
 
Rebates and allowances
Year ended December 31, 2019
 
$
4,654

 
$
16,729

 
$
(14,237
)
 
$
(161
)
 
$
6,985

Year ended December 31, 2018
 
$
2,860

 
$
13,202

 
$
(11,047
)
 
$
(361
)
 
$
4,654

Year ended December 31, 2017
 
$
2,297

 
$
9,568

 
$
(8,351
)
 
$
(654
)
 
$
2,860

________________________________
(1)
Amounts charged to deductions from allowance for doubtful accounts represent the write-off of uncollectible balances and represent payments for rebates and allowances.