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Long-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 2,900,000 | $ 2,900,000 | $ 2,900,000
Debt issuance costs and debt discount | (49,159) | (53,249) | (44,806)
Long-term debt | 2,850,841 | 2,846,751 | 2,855,194
2010 Senior Notes due October 2020 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0 | 0 | 250,000
2010 Senior Notes due October 2040 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 250,000 | 250,000 | 250,000
2011 Senior Notes due November 2041 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 300,000 | 300,000 | 300,000
2013 Senior Notes due March 2023 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 250,000 | 250,000 | 250,000
2016 Senior Notes due August 2021 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0 | 0 | 350,000
2017/2018 Senior Notes due December 2025 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 1,500,000 | 1,500,000 | 1,500,000
2019 Senior Notes due December 2027 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 600,000 | $ 600,000 | $ 0

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