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Major Customers (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenue, Major Customer [Line Items]      
Sales to largest customers (Percentage) 53.00% 47.00% 52.00%
Sales to our largest customers   $ 300.9  
Sales To Ten Largest Customers [Member]
      
Revenue, Major Customer [Line Items]      
Number of customers 10    
Sales to Two Of Largest Customers [Member]
      
Revenue, Major Customer [Line Items]      
Number of customers   2