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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of Sales Discounts and Returns Allowance Activity in our sales discounts and returns allowance was as follows (in thousands):
 
2018
 
2017
 
2016
Balance, January 1
$
6,920

 
$
5,901

 
$
5,677

Charges to reserve
15,058

 
18,377

 
12,935

Reductions for sales discounts and returns
(17,559
)
 
(17,358
)
 
(12,711
)
Balance, December 31
$
4,419

 
$
6,920

 
$
5,901