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)

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Fair Value Measurements - Fair Value and Carrying Value of Significant Fixed Rate Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 10, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Value $ 711,897 $ 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 $ 258,125 263,438  
Carrying Value $ 250,000 $ 250,000  
Stated interest rate 6.125%   6.125%