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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

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