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Debt (Minimum Repayments On Outstanding Borrowings Under Term Loans And Convertible Notes Excluding Discounts, Premium And Conversion Features) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
2012 $ 70,313  
2013 93,750  
2014 125,000  
2015 762,500  
2016 750,000  
Thereafter 2,350,000  
Total 4,151,563  
U.S. Term Loans [Member]
   
Debt Instrument [Line Items]    
2012 70,313  
2013 93,750  
2014 125,000  
2015 187,500  
2016 750,000  
Thereafter     
Total 1,226,563 1,250,000
Cash Convertible Notes [Member]
   
Debt Instrument [Line Items]    
2012     
2013     
2014     
2015 575,000  
2016     
Thereafter     
Total 575,000  
2017 Senior Notes [Member]
   
Debt Instrument [Line Items]    
2012     
2013     
2014     
2015     
2016     
Thereafter 550,000  
Total 550,000  
2018 Senior Notes [Member]
   
Debt Instrument [Line Items]    
2012     
2013     
2014     
2015     
2016     
Thereafter 800,000  
Total 800,000  
2020 Senior Notes [Member]
   
Debt Instrument [Line Items]    
2012     
2013     
2014     
2015     
2016     
Thereafter 1,000,000  
Total $ 1,000,000