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Debt Estimated Fair Value of Long-Term Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Less: Current maturities of long-term debt $ 0 $ (62,505)
Long-term debt 0 3,779,499
Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 3,977,926 3,842,004
Less: Current maturities of long-term debt 0 (62,505)
Long-term debt 0 3,779,499
Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 759,589 2,158,847
Less: Current maturities of long-term debt 0 (60,660)
Long-term debt 0 2,098,187
Senior unsecured notes    
Debt Instrument [Line Items]    
Long-term debt 3,400,000  
Senior unsecured notes | 4.90% Senior Notes due August 2020 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 62,535 62,505
Senior unsecured notes | 4.90% Senior Notes due August 2020 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 1,322 60,660
Senior unsecured notes | 4.625% Senior Notes due March 2021 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 79,937 79,854
Senior unsecured notes | 4.625% Senior Notes due March 2021 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 1,623 64,262
Senior unsecured notes | 3.95% Senior Notes due March 2022 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 21,213 21,181
Senior unsecured notes | 3.95% Senior Notes due March 2022 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 185 12,170
Senior unsecured notes | 7.75% Senior Notes due January 2024 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 397,025 389,800
Senior unsecured notes | 7.75% Senior Notes due January 2024 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 3,807 211,035
Senior unsecured notes | 7.95% Senior Notes due April 2025 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 450,000 446,962
Senior unsecured notes | 7.95% Senior Notes due April 2025 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 4,550 228,515
Senior unsecured notes | 7.875% Senior Notes due February 2026 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 750,000 739,371
Senior unsecured notes | 7.875% Senior Notes due February 2026 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 184,133 546,353
Senior unsecured notes | 6.20% Senior Notes due August 2040 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 393,597 390,526
Senior unsecured notes | 6.20% Senior Notes due August 2040 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 5,349 149,134
Senior unsecured notes | 6.05% Senior Notes due March 2041 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 395,000 389,809
Senior unsecured notes | 6.05% Senior Notes due March 2041 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 4,290 142,646
Senior unsecured notes | 5.25% Senior Notes due March 2042 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 483,619 478,122
Senior unsecured notes | 5.25% Senior Notes due March 2042 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 5,238 176,265
Senior unsecured notes | 8.95% Senior Notes due April 2045 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 400,000 390,763
Senior unsecured notes | 8.95% Senior Notes due April 2045 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 4,092 164,664
Seller loans | Seller-financed secured loan due September 2022 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 0 62,453
Seller loans | Seller-financed secured loan due September 2022 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 0 36,968
Seller loans | Seller-financed secured loan due February 2023 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 0 55,658
Seller loans | Seller-financed secured loan due February 2023 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 0 31,175
Line of credit | 2017 Credit Facility matures January 2023 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 545,000 335,000
Line of credit | 2017 Credit Facility matures January 2023 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 545,000 $ 335,000
Noble-UK    
Debt Instrument [Line Items]    
Write-off of debt financing costs and discount $ 45,469