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General Information and Basis of Accounting - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
 [1]
Jun. 30, 2020
Dec. 31, 2019
 [1]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Percent decrease in revenue 4.60%            
Deferred income taxes   $ 768,824   $ 900,633      
Stockholders' equity   (2,355,336) $ (2,335,064) (2,557,865) $ (1,937,604) $ (1,963,650) $ (1,985,218)
Additional Paid-in Capital              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' equity   (2,308,344) (2,304,954) (2,530,410) (1,647,242) (1,384,886) (1,347,614)
Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' equity   $ (200,174) $ (121,977) (116,999) $ (290,320) $ (578,722) $ (637,562)
Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Deferred income taxes       70,100      
Stockholders' equity       227,841      
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-in Capital              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' equity       233,874      
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' equity       (6,033)      
Cumulative Effect, Period of Adoption, Adjustment | Senior Convertible PIK Notes | PIK Note              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Adjustment of unamortized discount       $ (297,900)      
[1] The shares of the Company's common stock, prior to the Transactions, have been retroactively restated as shares reflecting the exchange ratio established in the Transactions.