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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Aug. 04, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, gross	$ 291,314		$ 399,579
Unamortized debt premium (discount)	(31,856)		770
Debt issuance cost	(7,588)		(3,232)
Less: current maturities	(1,295)		(717)
Long-term debt	290,019		398,862
2021 Notes
Debt Instrument [Line Items]
Long-term debt, gross	12,655		400,000
2025 Notes
Debt Instrument [Line Items]
Long-term debt, gross	315,489	$ 282,600	0
Unamortized debt premium (discount)		32,900
Long-term debt		$ 314,800
Other debt
Debt Instrument [Line Items]
Long-term debt, gross	2,614		2,041
2017 Credit Facility | Senior secured revolving credit facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 0		$ 0

X

- Definition

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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