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Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Apr. 30, 2020
Dec. 31, 2019
Debt [Line Items]      
Revolving credit agreement $ 0   $ 0
Debt issuance costs (9,834)   (12,370)
Long-term Debt, Excluding Current Maturities 860,422   887,630
6.50% Notes due 2024 | Senior Notes      
Debt [Line Items]      
Long-term Debt   $ 21,999  
6.50% Notes due 2024 | Fair Value, Inputs, Level 1 | Senior Notes      
Debt [Line Items]      
Long-term Debt $ 870,256   $ 900,000