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Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt [Line Items]    
Revolving credit agreement $ 125,000 $ 0
Debt issuance costs (10,740) (12,370)
Debt, Long-term and Short-term, Combined Amount, Total 1,014,260 887,630
6.50% Notes due 2024    
Debt [Line Items]    
Senior Notes $ 900,000 $ 900,000