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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
years
days
Dec. 31, 2010
Dec. 31, 2009
Summary Of Significant Accounting Policies [Line Items]      
Cash equivalents $ 155,000,000 $ 306,000,000  
Long-term investments, par value 28,000,000    
Interest rate reset day (Minimum) 7    
Interest rate reset day (Maximum) 35    
Maturity term (Minimum), years 10    
Unrealized losses still held 3,327,000 3,853,000  
Unrealized gains on long-term Investments 500,000 500,000 900,000
Options to purchase of common shares 3,400,000 2,700,000 4,100,000
Total compensation cost recognized for stock-based awards 5,100,000 5,400,000 5,400,000
Income tax benefit recognized in the income statement for stock-based awards 1,700,000 1,900,000 1,800,000
Percentage of performance goal to be achieved for target number of shares to be vest 100.00%    
Weighted-average grant date fair value, per option $ 8.14 $ 9.03 $ 7.58
Total cash received as a result of stock option exercises 2,571,000 3,252,000 3,602,000
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards 900,000 1,300,000 900,000
Total intrinsic value of stock options exercised 1,400,000 2,100,000 2,600,000
Targeted number of performance based restricted stock unit awards 100,000    
Expenses related to foreign currency translation 1,500,000 2,400,000 1,900,000
Correction of an immaterial error, increase in cost of goods sold   1,300,000 500,000
Correction of an immaterial error, decrease in net income   1,300,000 500,000
Correction of an immaterial error, decrease in net income per share diluted   $ 0.02 $ 0.01
Correction of an immaterial error, decrease in inventory   700,000 500,000
Correction of an immaterial error, increase in accounts payable   1,100,000  
Correction of an immaterial error, decrease in retained earnings   1,800,000 500,000
Buildings And Building Improvements [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets, minimum (years) 5    
Useful lives of the assets, maximum (years) 40    
Machinery And Equipment [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets, minimum (years) 2    
Useful lives of the assets, maximum (years) 10    
Furniture And Fixtures [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets, minimum (years) 2    
Useful lives of the assets, maximum (years) 10    
Vehicles [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets, minimum (years) 2    
Useful lives of the assets, maximum (years) 5    
Stock Options [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Total unrecognized compensation cost 4,200,000    
Total unrecognized compensation cost, weighted-average recognition period, years 1.7    
Options issued 400,000 61,000 600,000
Restricted Shares [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Total unrecognized compensation cost 3,800,000    
Total unrecognized compensation cost, weighted-average recognition period, years 2.6    
Restricted Stock Units And Phantom Stock Awards [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Total unrecognized compensation cost 1,300,000    
Total unrecognized compensation cost, weighted-average recognition period, years 2.2    
Performance Based Restricted Stock Units [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Reversal of stock-based compensation expense. 200,000    
Total unrecognized compensation cost 1,300,000    
Total unrecognized compensation cost, weighted-average recognition period, years 3.2    
Auction Rate Securities [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Long-term investments, fair value $ 24,700,000