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Significant Accounting Policies (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Significant Accounting Policies [Abstract]        
Net gain (impairment net of gains) on sale of marketable securities previously impaired $ (2,017) $ 785 $ 1,277  
Other than temporary impairment, loss on sale of securities     3,134  
Other than temporary impairment, gain on sale of securities     1,857  
Asset impairment charges 0 0 0  
Goodwill impairment losses 0 0 0 0
Estimated useful lives of intangible assets, minimum (in years) 0.5      
Estimated useful lives of intangible assets, maximum (in years) 20      
Impairment of assets held for use 0 0 0  
Severance expenses 4,823 4,053 4,037  
Provision for estimated sales returns, stock rotations, and other customer rights 10,117 14,074    
Maximum percentage of annual compensation contributed by employees towards employee benefit plan 50.00%      
Maximum amount contributed by employees toward employee benefit plan 16,500   3,134  
Additional amount contributed by employees aged 50 and over towards employee benefit plan 5,500      
Percentage of employee contributions contributed by employer towards employee benefit plan 50.00%      
Maximum percentage of employee's eligible compensation 3.00%      
Contributions by employer 991 904 848  
Minimum percentage of tax benefit realized upon settlement 50.00%      
Advertising expenses 2,918 3,098 1,400  
Allowance for doubtful accounts 6,722 7,096    
Bad debt expense 702 97 2,052  
Write off of bad debts 1,076 1,575 274  
Notional amount of outstanding forward contract 34,676 187,676    
Net gains (losses) recognized in financial income, net (240) 10,848 6,048  
Number of outstanding option contracts 16,762,000      
Cash flow hedge gain reclassified to operating expense $ 208 $ 428    
Anti-dilutive shares excluded from computation of earnings per share amount 1,342,904 1,147,378 8,386,309