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Long-Term Debt (6.75% Senior Notes) (Details) - USD ($)
9 Months Ended
Nov. 03, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jun. 26, 2019
Debt Instrument [Line Items]          
Repayments of debt   $ 52,964,000 $ 1,242,918,000    
6.75% Senior Notes          
Debt Instrument [Line Items]          
Interest rate   6.75%   6.75% 6.75%
Debt instrument, face amount         $ 500,000,000
6.75% Senior Notes | Subsequent Event          
Debt Instrument [Line Items]          
Repayments of debt $ 47,200,000        
6.75% Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Interest rate   6.75%     6.75%
Debt issuance costs         $ 7,300,000
Prior to July 1, 2022 | 6.75% Senior Notes          
Debt Instrument [Line Items]          
Redemption price (as a percent)   100.00%