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Fair Value Measurements - Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Oct. 11, 2018
--- | --- | --- | --- | ---
Fair Value of Financial Instruments |  |  |  |
Interest rate on senior notes due (as a percent) | 7.25% |  |  |
Less: deferred financing costs | $ 30,001 |  | $ 30,332 |
Long-term Debt, Excluding Current Maturities, Total | $ 3,276,103 |  | 3,333,220 |
5.00% senior notes due September 2020 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Interest rate on senior notes due (as a percent) | 5.00% |  |  |
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% |  |
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% |  |
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% |  |
0.75% senior exchangeable notes due January 2024 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Interest rate on senior notes due (as a percent) | 0.75% |  |  |
5.75% senior notes due February 2025 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Interest rate on senior notes due (as a percent) | 5.75% |  |  |
7.25% senior notes due January 2026 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Interest rate on senior notes due (as a percent) | 7.25% |  |  |
7.50% senior notes due January 2028 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Interest rate on senior notes due (as a percent) | 7.50% |  |  |
2018 Revolving Credit Facility |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Interest rate on senior notes due (as a percent) |  |  |  | 5.50%
Fair Value |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | $ 2,056,158 |  | 3,196,660 |
Fair Value | 5.00% senior notes due September 2020 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 138,582 |  | 284,907 |
Fair Value | 4.625% senior notes due September 2021 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 120,167 |  | 632,516 |
Fair Value | 5.50% senior notes due January 2023 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 17,608 |  | 483,834 |
Fair Value | 5.10% senior notes due September 2023 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 75,234 |  | 303,860 |
Fair Value | 0.75% senior exchangeable notes due January 2024 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 200,894 |  | 431,503 |
Fair Value | 5.75% senior notes due February 2025 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 315,191 |  | 705,040 |
Fair Value | 7.25% senior notes due January 2026 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 379,686 |  |  |
Fair Value | 7.50% senior notes due January 2028 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 248,796 |  |  |
Fair Value | 2012 Revolving Credit Facility |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt |  |  | 355,000 |
Fair Value | 2018 Revolving Credit Facility |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 560,000 |  |  |
Carrying Value |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 3,306,104 |  | 3,363,552 |
Less: deferred financing costs | 30,001 |  | 30,332 |
Long-term Debt, Excluding Current Maturities, Total | 3,276,103 |  | 3,333,220 |
Carrying Value | 5.00% senior notes due September 2020 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 139,142 |  | 282,046 |
Carrying Value | 4.625% senior notes due September 2021 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 155,044 |  | 634,588 |
Carrying Value | 5.50% senior notes due January 2023 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 36,959 |  | 501,003 |
Carrying Value | 5.10% senior notes due September 2023 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 155,738 |  | 336,810 |
Carrying Value | 0.75% senior exchangeable notes due January 2024 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 484,035 |  | 472,603 |
Carrying Value | 5.75% senior notes due February 2025 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 775,186 |  | 781,502 |
Carrying Value | 7.25% senior notes due January 2026 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 600,000 |  |  |
Carrying Value | 7.50% senior notes due January 2028 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | 400,000 |  |  |
Carrying Value | 2012 Revolving Credit Facility |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt |  |  | $ 355,000 |
Carrying Value | 2018 Revolving Credit Facility |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Debt | $ 560,000 |  |  |

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