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Long-Term Debt (Senior Notes) (Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Sep. 30, 2010
U.S. Term Loans [Member]
Jan. 31, 2012
U.S. Term Loans [Member]
Dec. 31, 2011
U.S. Term Loans [Member]
Nov. 30, 2011
U.S. Term Loans [Member]
Nov. 30, 2010
U.S. Tranche B Term Loans [Member]
May 31, 2010
U.S. Tranche B Term Loans [Member]
Dec. 31, 2010
U.S. Tranche B Term Loans [Member]
Dec. 31, 2011
2017 Senior Notes [Member]
Dec. 31, 2010
2017 Senior Notes [Member]
May 31, 2010
2017 Senior Notes [Member]
Dec. 31, 2011
2018 Senior Notes [Member]
Jan. 31, 2011
2018 Senior Notes [Member]
Dec. 31, 2010
2018 Senior Notes [Member]
Nov. 30, 2010
2018 Senior Notes [Member]
Dec. 31, 2011
2020 Senior Notes [Member]
Dec. 31, 2010
2020 Senior Notes [Member]
Jul. 31, 2010
2020 Senior Notes [Member]
May 31, 2010
2020 Senior Notes [Member]
Debt Instrument [Line Items]                                          
Long term debt $ 5,168,226,000 $ 5,268,185,000     $ 500,000,000 $ 500,000,000 $ 1,250,000,000     $ 500,000,000 $ 550,000,000 $ 550,000,000   $ 818,774,000 $ 500,000,000 $ 787,728,000 $ 800,000,000 $ 1,014,643,000 $ 1,015,848,000    
Repayments of Long-term Debt 1,644,198,000 2,115,402,000 350,032,000 300,000,000       800,000,000 1,000,000,000                        
Aggregate principal amount issued                         550,000,000             300,000,000 700,000,000
Percentage of aggregate principal amount issued                         7.625%               7.875%
Issue price of notes, percentage                                   105.50%      
Effective yield to maturity                                   7.087%      
Debt instrument, maturity date                     Jul. 15, 2017     Nov. 15, 2018       Jul. 15, 2020      
Fixed interest rate of debt                     7.625%     6.00%       7.875%      
Portion of debt associated with the premium                           818,800,000              
Premium on debt                                   14,600,000,000      
Discount on debt                           11,000,000              
Fair value adjustment                           $ 29,800,000              
Variable interest rate of debt plus LIBOR                           2.96%              
Equivalent percentage of redeemed amount                     100.00%     100.00%       100.00%      
Percentage redeemable of the aggregate principal amount                     35.00%     35.00%       35.00%      
Percentage offered to repurchase in case of change of control events                     101.00%     101.00%       101.00%