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Fair Value Measurements - Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value of Financial Instruments    
Carrying Value $ 4,203,301  
Less: deferred financing costs 27,997 $ 26,049
Carrying Value    
Fair Value of Financial Instruments    
Debt 4,055,944 3,604,681
Less: deferred financing costs 27,997 26,049
Debt, net of financing costs 4,027,947 3,578,632
Fair Value    
Fair Value of Financial Instruments    
Debt $ 4,024,277 $ 3,739,129
2.35% senior notes due September 2016    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 2.35%  
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) 6.27% 6.40%
6.15% senior notes due February 2018 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 460,762 $ 827,539
6.15% senior notes due February 2018 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 462,674 $ 865,300
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) 9.77% 9.33%
9.25% senior notes due January 2019 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 303,489 $ 303,489
9.25% senior notes due January 2019 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 321,028 $ 337,443
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) 5.43% 5.21%
5.00% senior notes due September 2020 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 669,846 $ 669,540
5.00% senior notes due September 2020 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 670,757 $ 689,211
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) 4.76% 4.75%
4.625% senior notes due September 2021 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 695,108 $ 694,868
4.625% senior notes due September 2021 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 665,003 $ 708,765
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% 5.85%
5.50% senior notes due January 2023 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 600,000 $ 600,000
5.50% senior notes due January 2023 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 584,850 $ 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) 5.28% 5.26%
5.10% senior notes due September 2023 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 346,576 $ 346,448
5.10% senior notes due September 2023 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 325,844 $ 348,613
0.75% senior exchangeable notes due January 2024    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 0.75%  
Interest Rate (as a percent) 5.90%  
0.75% senior exchangeable notes due January 2024 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 429,982  
0.75% senior exchangeable notes due January 2024 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 443,940  
Term Loan Facility    
Fair Value of Financial Instruments    
Interest Rate (as a percent)   1.76%
Term Loan Facility | Carrying Value    
Fair Value of Financial Instruments    
Debt   $ 162,500
Term Loan Facility | Fair Value    
Fair Value of Financial Instruments    
Debt   $ 162,500
Revolving Credit Facility    
Fair Value of Financial Instruments    
Interest Rate (as a percent) 2.73% 1.86%
Revolving Credit Facility | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 510,000  
Revolving Credit Facility | Fair Value    
Fair Value of Financial Instruments    
Debt $ 510,000  
Commercial paper    
Fair Value of Financial Instruments    
Interest Rate (as a percent) 1.87% 1.16%
Commercial paper | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 40,000  
Commercial paper | Fair Value    
Fair Value of Financial Instruments    
Debt 40,000  
Other | Carrying Value    
Fair Value of Financial Instruments    
Debt 181 $ 297
Other | Fair Value    
Fair Value of Financial Instruments    
Debt $ 181 $ 297