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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Schedule of Sales Discounts and Returns Allowance
Activity in our sales discounts and returns allowance was as follows (in thousands):
 
2015
 
2014
 
2013
Balance, January 1
$
4,296

 
$
4,106

 
$
4,990

Charges to reserve
16,700

 
15,285

 
13,345

Reductions for sales discounts and returns
(15,569
)
 
(15,095
)
 
(14,229
)
Business acquisition (Note 2)
250

 
—

 
—

Balance, December 31
$
5,677

 
$
4,296

 
$
4,106