Commitments and Contingencies - Summary of Future Obligations (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Purchase Obligations
2019	$ 3,637
2020	0
2021	0
2022	0
2023	0
2024 and Beyond	0
Total	3,637
Future Minimum Capital Lease Payments
2019	3,231
2020	0
2021	0
2022	0
2023	0
2024 and Beyond	0
Total	3,231
Future Minimum Operating Lease Payments
Lease Obligations
2019	1,733
2020	0
2021	0
2022	0
2023	0
2024 and Beyond	0
Total	1,733
Surface Lease Obligations
Lease Obligations
2019	129
2020	129
2021	130
2022	89
2023	89
2024 and Beyond	2,180
Total	2,746
Omnibus Fees
Contractual Obligations
2019	6,850
2020	0
2021	0
2022	0
2023	0
2024 and Beyond	0
Total	6,850
Transportation Fees
Contractual Obligations
2019	1,825
2020	605
2021	0
2022	0
2023	0
2024 and Beyond	0
Total	$ 2,430

Amount of minimum lease payments for capital leases.

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