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Long-Term Debt - Refinancing Transactions (Details) - USD ($)
12 Months Ended
Sep. 20, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Payments for related fees and expenses   $ 27,339,000 $ 32,738,000 $ 48,297,000
Loss on extinguishment of debt   $ 4,601,000 $ 12,437,000 $ (104,000)
Refinancing Transactions | WRF        
Debt Instrument [Line Items]        
Payments for related fees and expenses $ 19,300,000      
Debt issuance costs 15,100,000      
Loss on extinguishment of debt 12,400,000      
WRF 5 1/8% Senior Notes, due 2029 | Senior Notes | WRF        
Debt Instrument [Line Items]        
Debt instrument, aggregate principal amount 750,000,000.0      
Debt instrument, interest rate   5.125%    
WRF Term Loan | Secured Debt | WRF        
Debt Instrument [Line Items]        
Debt instrument, aggregate principal amount 1,000,000,000.0      
WRF Revolver | Revolving Credit Facility | WRF        
Debt Instrument [Line Items]        
Debt instrument, aggregate principal amount $ 850,000,000.0