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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 17, 2020 | Jan. 16, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Principal | $ 3,389,743 | $ 3,431,302 |  |
Unamortized Premium and Debt Issuance Costs | 30,166 | 37,586 |  |
Net Value | 3,359,577 | 3,393,716 |  |
Credit Facility | Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal | 300,000 | 0 |  |
Unamortized Premium and Debt Issuance Costs | 2,423 | 0 |  |
Net Value | 297,577 | 0 |  |
Credit Facility | Revolving Credit Facility | Revolving Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal | 133,000 | 643,700 |  |
Unamortized Premium and Debt Issuance Costs | 0 | 0 |  |
Net Value | 133,000 | 643,700 |  |
Unamortized debt issuance costs | 5,200 | $ 5,800 |  |
Credit Facility | Revolving Credit Facility | Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized debt issuance costs | $ 2,400 |  |  |
Senior Notes | 6.000% senior unsecured notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 600.00% | 600.00% | 6.00% |
Principal | $ 0 | $ 80,859 |  |
Unamortized Premium and Debt Issuance Costs | 0 | 504 |  |
Net Value | $ 0 | $ 80,355 |  |
Senior Notes | 5.625% senior unsecured notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 562.50% | 562.50% |  |
Principal | $ 341,135 | $ 341,135 |  |
Unamortized Premium and Debt Issuance Costs | 2,320 | 2,963 |  |
Net Value | $ 338,815 | $ 338,172 |  |
Senior Notes | 6.500% senior unsecured notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 650.00% | 650.00% |  |
Principal | $ 534,834 | $ 534,834 |  |
Unamortized Premium and Debt Issuance Costs | 4,749 | 5,639 |  |
Net Value | $ 530,085 | $ 529,195 |  |
Senior Notes | 6.250% senior unsecured notes due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 625.00% | 625.00% |  |
Principal | $ 359,799 | $ 359,799 |  |
Unamortized Premium and Debt Issuance Costs | 3,605 | 4,189 |  |
Net Value | $ 356,194 | $ 355,610 |  |
Senior Notes | 8.000% senior unsecured notes due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 800.00% | 800.00% | 8.00% |
Principal | $ 1,000,000 | $ 750,000 |  |
Unamortized Premium and Debt Issuance Costs | 6,993 | 13,022 |  |
Net Value | $ 993,007 | $ 736,978 |  |
Senior Notes | 7.750% senior unsecured notes due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 775.00% | 775.00% |  | 7.75%
Principal | $ 720,975 | $ 720,975 |  |
Unamortized Premium and Debt Issuance Costs | 10,076 | 11,269 |  |
Net Value | $ 710,899 | $ 709,706 |  |

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