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Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Long-term debt          
Principal balance of debt redeemed     $ 1,500,000 $ 650,001  
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 $ 191,751 $ 219,328 $ 383,088 $ 441,338  
7 1/8% Senior Notes due 2016          
Long-term debt          
Interest rate (as a percent) 7.125%   7.125%   7.125%
4 5/8% Senior Notes due 2017          
Long-term debt          
Interest rate (as a percent) 4.625%   4.625%   4.625%
4 1/4% Senior Notes due 2018          
Long-term debt          
Interest rate (as a percent) 4.25%   4.25%   4.25%
7 7/8% Senior Notes due 2019          
Long-term debt          
Interest rate (as a percent) 7.875%   7.875%   7.875%
5 1/8% Senior Notes due 2020          
Long-term debt          
Interest rate (as a percent) 5.125%   5.125%   5.125%
6 3/4% Senior Notes due 2021          
Long-term debt          
Interest rate (as a percent) 6.75%   6.75%   6.75%
5 7/8% Senior Notes due 2022          
Long-term debt          
Interest rate (as a percent) 5.875%   5.875%   5.875%
5% Senior Notes due 2023          
Long-term debt          
Interest rate (as a percent) 5.00%   5.00%   5.00%
5 7/8% Senior Notes due 2024          
Long-term debt          
Interest rate (as a percent) 5.875%   5.875%   5.875%
7 3/4% Senior Notes due 2026          
Long-term debt          
Interest rate (as a percent) 7.75%   7.75%   7.75%
Redemption price as a percentage of principal amount     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%