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Debt (Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Indebtedness to banks under credit facilities $ 0 $ 481,300
Other 40,350 21,903
Total 5,118,775 4,043,148
Less current maturities of debt and short-term borrowings 32,896 280,851
Long-term debt 5,085,879 3,762,297
6.75% Senior Notes Due 2013 [Member]
   
Debt Instrument [Line Items]    
Senior notes   450,971
Senior notes interest rate 6.75%  
Debt Instrument, Face Amount 450,000  
8.75% Senior Notes Due 2016 [Member]
   
Debt Instrument [Line Items]    
Senior notes 590,999 588,974
Senior notes interest rate 8.75%  
Debt Instrument, Face Amount 600,000  
7.00% Senior Notes Due 2019 [Member]
   
Debt Instrument [Line Items]    
Senior notes 1,000,000 1,000,000
Senior notes interest rate 7.00%  
9.875% Senior Notes Due 2019 [Member]
   
Debt Instrument [Line Items]    
Senior notes 360,042 0
Senior notes interest rate 9.875%  
Debt Instrument, Face Amount 375,000  
7.25% Senior Notes Due 2020 [Member]
   
Debt Instrument [Line Items]    
Senior notes 500,000 500,000
Senior notes interest rate 7.25%  
7.25% Senior Notes Due 2021 [Member]
   
Debt Instrument [Line Items]    
Senior notes 1,000,000 1,000,000
Senior notes interest rate 7.25%  
Loans Payable [Member]
   
Debt Instrument [Line Items]    
Term loan ($1.4 billion face value) due 2018 1,627,384  
Debt Instrument, Face Amount $ 1,642,375  
Debt Instrument, Basis Spread on Variable Rate 4.50%