XML 46 R40.htm IDEA: XBRL DOCUMENT v2.4.0.6
Nature of Operations and Summary of Significant Accounting Policies Narrative (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
customers
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Inventory Valuation Reserve [Member]
Dec. 31, 2011
Inventory Valuation Reserve [Member]
Dec. 31, 2010
Inventory Valuation Reserve [Member]
Dec. 31, 2009
Inventory Valuation Reserve [Member]
Valuation Allowance [Line Items]              
Valuation Allowances and Reserves, Balance       $ 4,078 $ 3,191 $ 3,181 $ 4,184
Business And Accounting Policies (Textuals) [Abstract]              
Minimum ownership percentage of investments in affiliates required to be accounted for under the equity method 20.00%            
Maximum ownership percentage of investments in affiliates required to be accounted for under the equity method 50.00%            
Number of top customers used for evaluation of credit risk of consolidated sales 10            
Maximum percentage of consolidated sales attributable to one customer 10.00%            
Percentage of sales from top ten customers 38.00% 36.00% 38.00%        
Percentage of sales from foreign countries 56.00% 58.00% 57.00%        
Allowance for doubtful accounts 4,080 2,360          
Gain (loss) on foreign currency hedges (780) (1,233) (630)        
Shipping revenue (10,111) (8,595) (6,537)        
Advertising costs 4,828 4,548 3,268        
Shipping costs 13,344 11,443 8,488        
Research and development costs $ 14,398 $ 11,253 $ 5,969