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Debt (Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Other $ 34,400   $ 40,350
Total 5,110,511   5,118,775
Current maturities of debt 28,306 32,896 32,896
Long-term debt 5,082,205 5,085,879 5,085,879
Loans Payable [Member]
     
Debt Instrument [Line Items]      
Term loan ($1.64 billion face value) due 2018 1,623,955   1,627,384
Debt Instrument, Face Amount 1,638,250    
Debt Instrument, Basis Spread on Variable Rate 4.50%    
8.75% Senior Notes Due 2016 [Member]
     
Debt Instrument [Line Items]      
Senior notes 591,535   590,999
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 360,621   360,042
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%