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Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Derivative [Line Items]    
Payment received upon settlement   $ 9,910,000
Term of debt securities (in years) 10  
Outstanding senior notes 400,000,000  
Senior notes, maturity year 2013  
Foreign currency forward contracts settled for a loss, amount 700,000  
U.S. Treasury Note, maturity term (in years) 10  
Number of foreign currency forward contracts outstanding 0  
Fair value of outstanding treasury locks liability 36,500,000  
Notional amount of interest rate protection agreement outstanding 400,000,000  
Interest rate contracts, expected year of maturity 2012  
Net amount of settlement gains or losses on derivative instruments included in accumulated OCI, net gain amortized 1,800,000  
Net amount of settlement gains or losses on derivative instruments included in accumulated OCI, net gain realized after tax 1,200,000  
2003 Interest Rate Protection Agreement [Member]
    
Derivative [Line Items]    
Payment received upon settlement 22,800,000  
2008 Interest Rate Protection Agreement [Member]
    
Derivative [Line Items]    
Payment received upon settlement 4,400,000  
2010 Interest Rate Protection Agreement [Member]
    
Derivative [Line Items]    
Payment received upon settlement $ 9,900,000