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Debt - $400 Million 5% Senior Notes (Details) - USD ($)
6 Months Ended
Feb. 17, 2021
Feb. 09, 2021
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument [Line Items]        
Loss from extinguishment of debt     $ (2,949,000)  
Write-off of deferred financing costs       $ 235,000
$600 Million 4.50% Senior Notes [Member]        
Debt Instrument [Line Items]        
Face amount     $ 600,000,000.0  
Senior Notes [Member] | $400 Million 5% Senior Notes [Member]        
Debt Instrument [Line Items]        
Face amount $ 400,000,000 $ 400,000,000    
Stated interest rate (as a percent) 5.00% 5.00% 5.00%  
Redemption price of per thousand   $ 1,005.00    
Aggregate tendered amount   $ 161,900,000    
Loss from extinguishment of debt     $ (2,900,000)  
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member]        
Debt Instrument [Line Items]        
Face amount $ 600,000,000.0   $ 600,000,000  
Stated interest rate (as a percent) 4.50%   4.50%  
Redemption price (as a percent) 100.00%      
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member] | Redemption Period One [Member]        
Debt Instrument [Line Items]        
Redemption price (as a percent) 102.25%      
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member] | Redemption Period Two [Member]        
Debt Instrument [Line Items]        
Redemption price (as a percent) 101.50%      
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member] | Redemption Period Three [Member]        
Debt Instrument [Line Items]        
Redemption price (as a percent) 100.75%      
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member] | Redemption Period Four [Member]        
Debt Instrument [Line Items]        
Redemption price (as a percent) 100.00%