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Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt [Line Items]    
Revolving credit agreement $ 88,602 $ 0
Debt Issuance Cost (23,786) (27,072)
Long-term Debt, Excluding Current Maturities 935,072 843,184
6.50% Notes due 2024 | Fair Value, Inputs, Level 1 | Senior Notes    
Debt [Line Items]    
Long-term Debt $ 870,256 $ 870,256