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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Schedule of Sales Discounts and Returns Allowance
Activity in our sales discounts and returns allowance was as follows (in thousands):
 
2014
 
2013
 
2012
Balance, January 1
$
4,106

 
$
4,990

 
$
5,113

Charges to reserve
15,285

 
13,345

 
11,730

Reductions for sales discounts and returns
(15,095
)
 
(14,229
)
 
(11,853
)
Balance, December 31
$
4,296

 
$
4,106

 
$
4,990