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Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 19, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 2,880,000 |  | $ 2,900,000 | $ 2,900,000
Debt issuance costs and debt discount | (35,881) |  | (45,336) | (49,159)
Long-term debt, net | 2,839,119 |  | 2,854,664 | 2,850,841
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 | 275,000 | $ 275,000 | 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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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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