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Long-Term Debt (Details) (USD $)
3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
May 28, 2013
5% Senior Notes due 2017
Jun. 30, 2013
5% Senior Notes due 2017
Jun. 30, 2013
5% Senior Notes due 2017
Jun. 24, 2013
5% Senior Notes due 2017
Apr. 05, 2013
4 1/4% Senior Notes due 2018
Jun. 30, 2013
4 1/4% Senior Notes due 2018
Apr. 05, 2013
5 1/8% Senior Notes due 2020
Jun. 30, 2013
5 1/8% Senior Notes due 2020
May 28, 2013
6 1/4% Senior Notes due 2023
Jun. 30, 2013
6 1/4% Senior Notes due 2023
Jun. 30, 2013
6 1/4% Senior Notes due 2023
Jun. 24, 2013
6 1/4% Senior Notes due 2023
Jun. 30, 2013
7 % Senior Notes due 2013
Dec. 31, 2012
7 % Senior Notes due 2013
Long-term debt                                    
Aggregate principal amount         $ 1,250,000,000       $ 1,200,000,000   $ 1,100,000,000   $ 1,350,000,000       $ 500,000,000  
Term of debt instrument         4 years       5 years   7 years   10 years          
Debt instrument issuance as a percentage of face amount         100.00%       100.00%   100.00%   100.00%          
Interest rate (as a percent)         5.00%       4.25% 4.25% 5.125% 5.125% 6.25%       7.00% 7.00%
Redemption price as a percentage of principal amount               100.00% 100.00%   100.00%         101.00%    
Maximum percentage of the aggregate principal amount of notes with net proceeds of certain equity offerings or capital contributions                 35.00%   35.00%              
Percentage of principal amount at which notes may be required to be repurchased in event of change of control                 101.00%   101.00%              
Premiums, interest expense and deferred financing costs, as applicable $ 247,461,000 $ 148,830,000 $ 443,227,000 $ 283,116,000   $ 7,000,000 $ 7,000,000             $ 23,000,000 $ 23,000,000