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Debt (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Debt [Line Items]  
Revolving credit agreement $ 8,091
Debt issuance costs (12,712)
Debt, Long-term and Short-term, Combined Amount, Total 895,379
6.50% Notes due 2024  
Debt [Line Items]  
Senior Notes $ 900,000