Commitments and Contingencies - Summary of Future Obligations (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Future Minimum Finance Lease Payments
2020	$ 0
2021	2,005
2022	0
2023	0
2024	0
2025 and Beyond	0
Total	2,005
Purchase Obligations
2020	4,947
2021	0
2022	0
2023	0
2024	0
2025 and Beyond	0
Total	4,947
Lease Obligations
2020	2,500
2021	300
2020	32,501
2021	35,582
2022	34,370
2023	35,054
2024	35,848
2025 and Beyond	64,666
Total	238,021
Future Minimum Operating Lease Payments
Lease Obligations
2020	2,528
2021	260
2022	0
2023	0
2024	0
2025 and Beyond	0
Total	2,788
Surface Lease Obligations
Lease Obligations
2020	215
2021	216
2022	175
2023	175
2024	175
2025 and Beyond	3,857
Total	4,813
Omnibus Fees
Contractual Obligations
2020	6,850
2021	0
2022	0
2023	0
2024	0
2025 and Beyond	0
Total	6,850
Transportation Fees
Contractual Obligations
2020	17,961
2021	33,101
2022	34,195
2023	34,879
2024	35,673
2025 and Beyond	60,809
Total	$ 216,618

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Contractual And Purchase Obligations And Lease Liability, Due In Year Four

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Contractual And Purchase Obligations And Lease Liability, Due In Year Three

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of contractual obligation due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of contractual obligation due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in next fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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