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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal | $ 3,431,302 | $ 3,459,300
Unamortized Discount and Debt Issuance Costs | 37,586 | 30,063
Long-term Debt, Total | 3,393,716 | 3,429,237
Senior secured credit facility |  |
Debt Instrument [Line Items] |  |
Principal | 643,700 | 959,300
Unamortized Discount and Debt Issuance Costs | 0 | 0
Long-term Debt, Total | 643,700 | 959,300
Unamortized debt issuance costs included in other long term assets | $ 5,800 | 7,600
6.750% senior unsecured notes due 2022 |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 675.00% |
Principal | $ 0 | 750,000
Unamortized Discount and Debt Issuance Costs | 0 | 9,349
Long-term Debt, Total | $ 0 | 740,651
6.000% senior unsecured notes due 2023 |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 600.00% |
Principal | $ 80,859 | 400,000
Unamortized Discount and Debt Issuance Costs | 504 | 3,557
Long-term Debt, Total | $ 80,355 | 396,443
5.625% senior unsecured notes due 2024 |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 562.50% |
Principal | $ 341,135 | 350,000
Unamortized Discount and Debt Issuance Costs | 2,963 | 3,923
Long-term Debt, Total | $ 338,172 | 346,077
6.500% senior unsecured notes due 2025 |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 650.00% |
Principal | $ 534,834 | 550,000
Unamortized Discount and Debt Issuance Costs | 5,639 | 7,020
Long-term Debt, Total | $ 529,195 | 542,980
6.250% senior unsecured notes due 2026 |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 625.00% |
Principal | $ 359,799 | 450,000
Unamortized Discount and Debt Issuance Costs | 4,189 | 6,214
Long-term Debt, Total | $ 355,610 | 443,786
8.000% senior unsecured notes due 2027 |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 800.00% |
Principal | $ 750,000 | 0
Unamortized Discount and Debt Issuance Costs | 13,022 | 0
Long-term Debt, Total | $ 736,978 | 0
7.750% senior unsecured notes due 2028 |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 775.00% |
Principal | $ 720,975 | 0
Unamortized Discount and Debt Issuance Costs | 11,269 | 0
Long-term Debt, Total | $ 709,706 | $ 0

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