Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Fair Value and Carrying Value of Significant Fixed Rate Long-Term Debt (Details)

v3.21.2
Fair Value Measurements - Fair Value and Carrying Value of Significant Fixed Rate Long-Term Debt (Details) - USD ($)
$ in Thousands
Oct. 13, 2021
Sep. 30, 2021
Dec. 31, 2020
Mar. 10, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying Value   $ 691,157 $ 720,067  
5.0% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stated interest rate   5.00%    
6.125% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value   $ 260,625 263,438  
Carrying Value   $ 250,000 $ 250,000  
Stated interest rate 6.125% 6.125%   6.125%
4.625 % Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stated interest rate 462.50%      
4.875% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stated interest rate 487.50%