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Long-Term Debt (Details) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 24, 2013
5% Senior Notes due 2017
May 28, 2013
5% Senior Notes due 2017
Jun. 30, 2013
5% Senior Notes due 2017
Apr. 05, 2013
4 1/4% Senior Notes due 2018
Sep. 30, 2013
4 1/4% Senior Notes due 2018
Apr. 05, 2013
4 1/4% Senior Notes due 2018
Redemption Prior to April 1, 2016
Apr. 05, 2013
5 1/8% Senior Notes due 2020
Sep. 30, 2013
5 1/8% Senior Notes due 2020
Apr. 05, 2013
5 1/8% Senior Notes due 2020
Redemption Prior to May 1, 2016
Jun. 24, 2013
6 1/4% Senior Notes due 2023
May 28, 2013
6 1/4% Senior Notes due 2023
Jun. 30, 2013
6 1/4% Senior Notes due 2023
Long-term debt                                
Aggregate principal amount           $ 1,250,000,000   $ 1,200,000,000     $ 1,100,000,000       $ 1,350,000,000  
Term of debt instrument           4 years   5 years     7 years       10 years  
Debt instrument issuance as a percentage of the face amount           100.00%   100.00%     100.00%       100.00%  
Interest rate (as a percent) 7.00%   7.00%     5.00%   4.25% 4.25%   5.125% 5.125%     6.25%  
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 $ 220,596,000 $ 182,438,000 $ 663,823,000 $ 465,554,000     $ 7,000,000                 $ 23,000,000