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Long-term Debt - Components of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Less: Amounts due within one year $ 0 $ 14,711    
Long-Term Debt, gross 915,000 817,448    
Less: Deferred debt issuance costs 12,803 8,006 $ 8,400 $ 9,583
Long-Term Debt 902,197 809,442    
Senior Notes        
Debt Instrument [Line Items]        
Long-term Debt, Gross 800,000 400,000    
Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Long-term Debt, Gross $ 115,000 $ 432,159