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Long-Term Debt (Details) (USD $)
1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 1 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
7 % Senior Notes due 2013
Jun. 30, 2012
7 % Senior Notes due 2013
Dec. 31, 2011
6 5/8% Senior Notes due 2014
Jun. 30, 2012
6 5/8% Senior Notes due 2014
Dec. 31, 2011
7 3/4% Senior Notes due 2015
Jun. 30, 2012
7 3/4% Senior Notes due 2015
Dec. 31, 2011
7 1/8% Senior Notes due 2016
Jun. 30, 2012
7 1/8% Senior Notes due 2016
Dec. 31, 2011
7 7/8% Senior Notes due 2019
Jun. 30, 2012
7 7/8% Senior Notes due 2019
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
Jun. 30, 2012
6 3/4% Senior Notes due 2021
May 05, 2011
6 3/4% Senior Notes due 2021
Dec. 31, 2011
6 3/4% Senior Notes due 2021
Redemption Prior to June 1, 2014
May 31, 2012
4 5/8% senior notes due 2017
Jun. 30, 2012
4 5/8% senior notes due 2017
May 16, 2012
4 5/8% senior notes due 2017
Jul. 31, 2012
5 7/8% Senior Notes due 2022
May 31, 2012
5 7/8% Senior Notes due 2022
Jul. 26, 2012
5 7/8% Senior Notes due 2022
Jun. 30, 2012
5 7/8% Senior Notes due 2022
May 16, 2012
5 7/8% Senior Notes due 2022
Debt Instrument                                                        
Repayments of debt   $ 915,000,000 $ 85,000,000                                                  
Interest rate (as a percent) 6.375%   6.375% 7.00% 7.00% 6.625% 6.625% 7.75% 7.75% 7.125% 7.125% 7.875% 7.875%       6.75% 6.75%       4.625%         5.875%  
Percentage of principal amount at which the entity may redeem some or all of the notes at any time       100.00%   100.00%   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       101.00%   101.00%   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       900,000,000         1,000,000,000
Term of debt instrument (in years)                       10 years         10 years       5 years     10 years 10 years      
Debt instrument issuance as a percentage of the face amount                           101.75% 97.467%       99.093%       100.00%     100.75%   100.00%
Maximum percentage of the aggregate principal amount of notes with net proceeds of certain equity offerings or capital contributions                               35.00%       35.00%   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