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Long-Term Debt - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Aug. 26, 2020
Jun. 30, 2020
May 30, 2017
Debt Instrument [Line Items]          
Total long-term debt $ 656,303 $ 615,916   $ 496,923  
Deferred finance costs, net 6,700 7,100   3,100  
Revolving unsecured credit facility, maturing 2024 | Line of Credit          
Debt Instrument [Line Items]          
Total long-term debt $ 163,000 123,000   200,000  
5.375% senior unsecured notes due 2024 | Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate (as a percent) 5.375%       5.375%
Total long-term debt $ 0 0   296,923  
4.625% senior unsecured notes due 2028 | Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate (as a percent) 4.625%   4.625%    
Total long-term debt $ 493,303 $ 492,916   $ 0