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Fair Value Measurements (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Aug. 31, 2011
Fair Value of Financial Instruments          
Less: deferred finance costs $ (18,012) $ (17,019)      
Short term investments   35,000      
Carrying Value          
Fair Value of Financial Instruments          
Debt 3,679,720 4,355,049      
Less: deferred finance costs 18,012 17,019      
Debt, net of financing costs 3,661,708 4,338,030      
Fair Value          
Fair Value of Financial Instruments          
Debt $ 3,445,699 $ 4,414,090      
2.35% senior notes due September 2016          
Fair Value of Financial Instruments          
Interest rate on senior notes due (as a percent) 2.35%     2.35%  
Effective Interest Rate (as a percent) 2.54% 2.56%      
2.35% senior notes due September 2016 | Carrying Value          
Fair Value of Financial Instruments          
Debt $ 347,955 $ 349,887      
2.35% senior notes due September 2016 | Fair Value          
Fair Value of Financial Instruments          
Debt $ 347,708 $ 346,980      
6.15% senior notes due February 2018          
Fair Value of Financial Instruments          
Interest rate on senior notes due (as a percent) 6.15%        
Effective Interest Rate (as a percent) 6.35% 6.42%      
6.15% senior notes due February 2018 | Carrying Value          
Fair Value of Financial Instruments          
Debt $ 921,162 $ 930,693      
6.15% senior notes due February 2018 | Fair Value          
Fair Value of Financial Instruments          
Debt $ 935,962 $ 991,920      
9.25% senior notes due January 2019          
Fair Value of Financial Instruments          
Interest rate on senior notes due (as a percent) 9.25%   9.25% 9.25%  
Effective Interest Rate (as a percent) 9.33% 9.33%      
9.25% senior notes due January 2019 | Carrying Value          
Fair Value of Financial Instruments          
Debt $ 339,607 $ 339,607      
9.25% senior notes due January 2019 | Fair Value          
Fair Value of Financial Instruments          
Debt $ 342,575 $ 403,531      
5.00% senior notes due September 2020          
Fair Value of Financial Instruments          
Interest rate on senior notes due (as a percent) 5.00%        
Effective Interest Rate (as a percent) 5.24% 5.20%      
5.00% senior notes due September 2020 | Carrying Value          
Fair Value of Financial Instruments          
Debt $ 683,839 $ 698,253      
5.00% senior notes due September 2020 | Fair Value          
Fair Value of Financial Instruments          
Debt $ 617,409 $ 687,953      
4.625% senior notes due September 2021          
Fair Value of Financial Instruments          
Interest rate on senior notes due (as a percent) 4.625%       4.625%
Effective Interest Rate (as a percent) 4.74% 4.75%      
4.625% senior notes due September 2021 | Carrying Value          
Fair Value of Financial Instruments          
Debt $ 698,628 $ 698,388      
4.625% senior notes due September 2021 | Fair Value          
Fair Value of Financial Instruments          
Debt $ 581,630 $ 661,619      
5.10% senior notes due September 2023          
Fair Value of Financial Instruments          
Interest rate on senior notes due (as a percent) 5.10%     5.10%  
Effective Interest Rate (as a percent) 5.24% 5.26%      
5.10% senior notes due September 2023 | Carrying Value          
Fair Value of Financial Instruments          
Debt $ 349,021 $ 348,893      
5.10% senior notes due September 2023 | Fair Value          
Fair Value of Financial Instruments          
Debt $ 280,907 $ 332,759      
Term Loan Facility          
Fair Value of Financial Instruments          
Effective Interest Rate (as a percent) 1.39% 0.00%      
Term Loan Facility | Carrying Value          
Fair Value of Financial Instruments          
Debt $ 325,000        
Term Loan Facility | Fair Value          
Fair Value of Financial Instruments          
Debt $ 325,000        
Revolving Credit Facility          
Fair Value of Financial Instruments          
Effective Interest Rate (as a percent) 1.48% 3.47%      
Revolving Credit Facility | Carrying Value          
Fair Value of Financial Instruments          
Debt   $ 450,000      
Revolving Credit Facility | Fair Value          
Fair Value of Financial Instruments          
Debt   $ 450,000      
Commercial paper          
Fair Value of Financial Instruments          
Effective Interest Rate (as a percent) 0.56% 0.59%      
Commercial paper | Carrying Value          
Fair Value of Financial Instruments          
Debt $ 8,000 $ 533,119      
Commercial paper | Fair Value          
Fair Value of Financial Instruments          
Debt $ 8,000 $ 533,119      
Other          
Fair Value of Financial Instruments          
Effective Interest Rate (as a percent) 0.00% 0.00%      
Other | Carrying Value          
Fair Value of Financial Instruments          
Debt $ 6,508 $ 6,209      
Other | Fair Value          
Fair Value of Financial Instruments          
Debt $ 6,508 $ 6,209