Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Fair Value Measurements - Fair Value and Carrying Value of Fixed Rate Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Mar. 10, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt, Carrying Value $ 720,067 $ 706,886  
6.125% Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt, Fair Value 263,438 261,250  
Long-term Debt, Carrying Value $ 250,000 $ 250,000  
Stated interest rate on debt agreement 6.125% 6.125% 6.125%
Mortgage Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt, Fair Value $ 215,928 $ 195,962  
Long-term Debt, Carrying Value $ 212,135 $ 194,535