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Long-Term Debt (Details) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Oct. 31, 2011
6 3/8% Senior Notes due 2011
Sep. 30, 2011
6 3/8% Senior Notes due 2011
Dec. 31, 2011
6 3/8% Senior Notes due 2011
Dec. 31, 2011
7 % Senior Notes due 2013
Dec. 31, 2011
6 5/8% Senior Notes due 2014
Dec. 31, 2011
7 3/4% Senior Notes due 2015
Dec. 31, 2011
7 1/8% Senior Notes due 2016
Dec. 31, 2011
7 7/8% Senior Notes due 2019
Y
Oct. 05, 2009
7 7/8% Senior Notes due 2019
Aug. 17, 2009
7 7/8% Senior Notes due 2019
Dec. 31, 2011
7 7/8% Senior Notes due 2019
Redemption Prior to September 1, 2012
Dec. 31, 2011
6 3/4% Senior Notes due 2021
Y
May 05, 2011
6 3/4% Senior Notes due 2021
Dec. 31, 2011
6 3/4% Senior Notes due 2021
Redemption Prior to June 15, 2014
Debt Instrument                              
Repayments of debt   $ 915,000,000 $ 85,000,000                        
Interest rate (as a percent) 6.375%   6.375% 6.375% 7.00% 6.625% 7.75% 7.125% 7.875%       6.75%    
Percentage of principal amount at which the entity may redeem some or all of the notes at any time (as a percent)         100.00% 100.00% 100.00% 100.00% 100.00%       100.00%    
Percentage of principal amount at which notes may be required to be repurchased in event of change of control (as a percent)         101.00% 101.00% 101.00% 101.00% 101.00%       101.00%    
Aggregate principal amount                   400,000,000 1,000,000,000     2,000,000,000  
Term of debt instrument (in years)                 10       10    
Debt instrument issuance as a percentage of the face amount                   101.75% 97.467%     99.093%  
Maximum percentage of the aggregate principal amount of notes with net proceeds of certain equity offerings or capital contributions                       35.00%     35.00%
Annual Debt Service Requirements         $ 35,000,000 $ 66,250,000 $ 58,125,000 $ 106,875,000 $ 110,250,000       $ 135,000,000