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Fair Value Measurements - Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value of Financial Instruments |  |
Less: deferred financing costs | $ 29,782 | $ 26,049
Carrying Value |  |
Fair Value of Financial Instruments |  |
Debt | 3,988,593 | 3,604,681
Less: deferred financing costs | 29,782 | 26,049
Debt, net of financing costs | 3,958,811 | 3,578,632
Fair Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 4,056,616 | 3,739,129
6.15% senior notes due February 2018 |  |
Fair Value of Financial Instruments |  |
Interest rate on senior notes due (as a percent) | 6.15% |
6.15% senior notes due February 2018 | Carrying Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 460,537 | 827,539
6.15% senior notes due February 2018 | Fair Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 467,620 | 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% |
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 | $ 327,902 | 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% |
5.00% senior notes due September 2020 | Carrying Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 669,769 | 669,540
5.00% senior notes due September 2020 | Fair Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 685,622 | 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% |
4.625% senior notes due September 2021 | Carrying Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 695,048 | 694,868
4.625% senior notes due September 2021 | Fair Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 686,096 | 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% |
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 | $ 598,242 | 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% |
5.10% senior notes due September 2023 | Carrying Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 346,544 | 346,448
5.10% senior notes due September 2023 | Fair Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 333,680 | 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% |
0.75% senior exchangeable notes due January 2024 | Carrying Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 425,010 |
0.75% senior exchangeable notes due January 2024 | Fair Value |  |
Fair Value of Financial Instruments |  |
Debt | 469,258 |
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 |  |
Carrying Value | 410,000 |
Revolving Credit Facility | Carrying Value |  |
Fair Value of Financial Instruments |  |
Debt | 410,000 |
Revolving Credit Facility | Fair Value |  |
Fair Value of Financial Instruments |  |
Debt | 410,000 |
Commercial paper |  |
Fair Value of Financial Instruments |  |
Carrying Value | 78,000 |
Commercial paper | Carrying Value |  |
Fair Value of Financial Instruments |  |
Debt | 78,000 |
Commercial paper | Fair Value |  |
Fair Value of Financial Instruments |  |
Debt | 78,000 |
Other | Carrying Value |  |
Fair Value of Financial Instruments |  |
Debt | 196 | 297
Other | Fair Value |  |
Fair Value of Financial Instruments |  |
Debt | $ 196 | $ 297

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