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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
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, 2017
 
$
969

 
$
136

 
$
(128
)
 
$
—

 
$
977

Year ended December 31, 2016
 
$
881

 
$
53

 
$
(30
)
 
$
65

 
$
969

Year ended December 31, 2015
 
$
585

 
$
773

 
$
(477
)
 
$
—

 
$
881

 
 
 
 
 
 
 
 
 
 
 
Rebates and allowances
Year ended December 31, 2017
 
$
2,297

 
$
9,568

 
$
(8,351
)
 
$
(654
)
 
$
2,860

Year ended December 31, 2016
 
$
2,303

 
$
7,255

 
$
(6,809
)
 
$
(452
)
 
$
2,297

Year ended December 31, 2015
 
$
2,164

 
$
6,413

 
$
(6,190
)
 
$
(84
)
 
$
2,303

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