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Long-Term Debt (6.75% Senior Notes) (Details) - USD ($)
12 Months Ended
Nov. 03, 2020
Jun. 26, 2019
Dec. 31, 2020
Minimum      
Debt Instrument [Line Items]      
Notice required for redemption   30 days  
Maximum      
Debt Instrument [Line Items]      
Notice required for redemption   60 days  
Senior Notes 6.75      
Debt Instrument [Line Items]      
Interest rate   6.75%  
Debt face amount   $ 500,000,000  
Debt issuance costs   $ 7,300,000  
Repayments of debt $ 47,200,000    
Write off of deferred debt issuance cost $ 600,000    
Senior Notes 6.75 | Debt Instrument, Redemption, Period 1      
Debt Instrument [Line Items]      
Redemption price rate     103.75%
Senior Notes 6.75 | Debt Instrument, Redemption, Period 2      
Debt Instrument [Line Items]      
Redemption price rate     101.6875%
Senior Notes 6.75 | Debt Instrument, Redemption, Period 3      
Debt Instrument [Line Items]      
Redemption price rate     100.00%
Senior Notes 6.75 | Debt Instrument, Redemption, Period 4      
Debt Instrument [Line Items]      
Redemption price rate   100.00%