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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

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