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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instruments    
Long-term debt $ 1,619,238 $ 1,688,867
Credit Facility    
Debt Instruments    
Long-term debt 323,500 393,000
2028 Notes    
Debt Instruments    
Long term debt gross 800,000 800,000
Debt premium, net of amortization 14,040 14,541
Deferred financing costs, net of amortization (11,669) (11,766)
Long-term debt 802,371 802,775
2027 Notes    
Debt Instruments    
Long term debt gross 500,000 500,000
Deferred financing costs, net of amortization (6,633) (6,908)
Long-term debt $ 493,367 $ 493,092