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Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 2,600,000 | $ 2,900,000 | $ 2,900,000
Debt issuance costs and debt discount | (30,165) | (45,336) | (47,249)
Long-term debt, net | 2,569,835 | 2,854,664 | 2,852,751
Senior Notes | 2010 Senior Notes due October 2040 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 250,000 | 250,000 | 250,000
Senior Notes | 2011 Senior Notes due November 2041 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 300,000 | 300,000 | 300,000
Senior Notes | 2013 Senior Notes due March 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 250,000 | 250,000 | 250,000
Senior Notes | 2017/2018 Senior Notes due December 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0 | 1,500,000 | 1,500,000
Senior Notes | 2019 Senior Notes due December 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 600,000 | 600,000 | 600,000
Senior Notes | 2021 Senior Notes due April 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 600,000 | 0 | 0
Senior Notes | 2021 Senior Notes due April 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 600,000 | $ 0 | $ 0

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