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Fair Value Measurements - Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value of Financial Instruments    
Carrying Value $ 3,608,723  
Less: Deferred financing costs (26,049) $ (18,012)
Carrying Value    
Fair Value of Financial Instruments    
Debt 3,604,681 3,679,720
Less: Deferred financing costs (26,049) (18,012)
Debt, net of financing costs 3,578,632 3,661,708
Fair Value    
Fair Value of Financial Instruments    
Debt $ 3,739,129 $ 3,445,699
2.35% senior notes due September 2016    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 2.35%  
Interest Rate (as a percent)   2.54%
2.35% senior notes due September 2016 | Carrying Value    
Fair Value of Financial Instruments    
Debt   $ 347,955
2.35% senior notes due September 2016 | Fair Value    
Fair Value of Financial Instruments    
Debt   $ 347,708
6.15% senior notes due February 2018    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 6.15%  
Interest Rate (as a percent) 6.40% 6.35%
6.15% senior notes due February 2018 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 827,539 $ 921,162
6.15% senior notes due February 2018 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 865,300 $ 935,962
9.25% senior notes due January 2019    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 9.25%  
Interest Rate (as a percent) 9.33% 9.33%
9.25% senior notes due January 2019 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 303,489 $ 339,607
9.25% senior notes due January 2019 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 337,443 $ 342,575
5.00% senior notes due September 2020    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 5.00%  
Interest Rate (as a percent) 5.21% 5.24%
5.00% senior notes due September 2020 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 669,540 $ 683,839
5.00% senior notes due September 2020 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 689,211 $ 617,409
4.625% senior notes due September 2021    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 4.625%  
Interest Rate (as a percent) 4.75% 4.74%
4.625% senior notes due September 2021 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 694,868 $ 698,628
4.625% senior notes due September 2021 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 708,765 $ 581,630
5.50% senior notes due January 2023    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 5.50%  
Interest Rate (as a percent) 5.85%  
5.50% senior notes due January 2023 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 600,000  
5.50% senior notes due January 2023 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 627,000  
5.10% senior notes due September 2023    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 5.10%  
Interest Rate (as a percent) 5.26% 5.24%
5.10% senior notes due September 2023 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 346,448 $ 349,021
5.10% senior notes due September 2023 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 348,613 $ 280,907
Term Loan Facility    
Fair Value of Financial Instruments    
Interest Rate (as a percent) 1.76% 1.39%
Term Loan Facility | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 162,500 $ 325,000
Term Loan Facility | Fair Value    
Fair Value of Financial Instruments    
Debt $ 162,500 $ 325,000
Revolving Credit Facility    
Fair Value of Financial Instruments    
Interest Rate (as a percent) 1.86% 1.48%
Commercial paper    
Fair Value of Financial Instruments    
Interest Rate (as a percent) 1.16% 0.56%
Commercial paper | Carrying Value    
Fair Value of Financial Instruments    
Debt   $ 8,000
Commercial paper | Fair Value    
Fair Value of Financial Instruments    
Debt   8,000
Other | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 297 6,508
Other | Fair Value    
Fair Value of Financial Instruments    
Debt $ 297 $ 6,508