Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instruments
Long-term debt	$ 1,516,135	$ 1,688,867
Credit Facility
Debt Instruments
Long-term debt	220,000	393,000
2028 Notes
Debt Instruments
Long term debt gross	800,000	800,000
Debt premium, net of amortization	13,037	14,541
Deferred financing costs, net of amortization	(10,821)	(11,766)
Long-term debt	802,216	802,775
2027 Notes
Debt Instruments
Long term debt gross	500,000	500,000
Deferred financing costs, net of amortization	(6,081)	(6,908)
Long-term debt	$ 493,919	$ 493,092

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt premium.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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