Commitments and Contingencies Commitments and Contigencies (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) MMcf MBbls
Supply Commitment
Dollar Commitment ($ in thousands) | $	$ 543,174
First Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	140,186
Second Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	117,235
Third Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	97,036
Fourth Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	70,981
commitments 5 years and beyond [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	$ 117,736
First facilities agreement with midstream provider [Member]
Supply Commitment
Incremental volume commitment	51.5
incremental volume commitment	97.9
Second facilities agreement with midstream provider [Member]
Supply Commitment
Incremental volume commitment	33.5
incremental volume commitment	77.3
Natural Gas (MMcf) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	477,967
Natural Gas (MMcf) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	103,061
Natural Gas (MMcf) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	84,660
Natural Gas (MMcf) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	73,047
Natural Gas (MMcf) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	73,248
Natural Gas (MMcf) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	143,951
Crude Oil (MBbls) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	100,953
Crude Oil (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	25,552
Crude Oil (MBbls) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	23,530
Crude Oil (MBbls) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	21,065
Crude Oil (MBbls) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	11,906
Crude Oil (MBbls) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	18,900
Wattenberg Field | Natural Gas (MMcf) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	342,740
Wattenberg Field | Natural Gas (MMcf) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	63,922
Wattenberg Field | Natural Gas (MMcf) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	63,922
Wattenberg Field | Natural Gas (MMcf) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	63,922
Wattenberg Field | Natural Gas (MMcf) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	64,098
Wattenberg Field | Natural Gas (MMcf) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	86,876
Wattenberg Field | Natural Gas (MMcf) [Member] | Supply Contract Expiration Date [Member]
Supply Commitment
Supply Commitments Contract Expiration Date	Aug. 31, 2026
Wattenberg Field | Crude Oil (MBbls) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	74,655
Wattenberg Field | Crude Oil (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	17,338
Wattenberg Field | Crude Oil (MBbls) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	15,500
Wattenberg Field | Crude Oil (MBbls) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	13,035
Wattenberg Field | Crude Oil (MBbls) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	9,882
Wattenberg Field | Crude Oil (MBbls) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	18,900
Wattenberg Field | Crude Oil (MBbls) [Member] | Supply Contract Expiration Date [Member]
Supply Commitment
Supply Commitments Contract Expiration Date	Aug. 31, 2026
Wattenberg Field | Water (MBbls) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	26,408
Wattenberg Field | Water (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	6,207
Wattenberg Field | Water (MBbls) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	6,207
Wattenberg Field | Water (MBbls) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	6,206
Wattenberg Field | Water (MBbls) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	6,224
Wattenberg Field | Water (MBbls) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	1,564
Wattenberg Field | Water (MBbls) [Member] | Supply Contract Expiration Date [Member]
Supply Commitment
Supply Commitments Contract Expiration Date	Dec. 31, 2024
Delaware Basin | Natural Gas (MMcf) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	121,882
Delaware Basin | Natural Gas (MMcf) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	32,022
Delaware Basin | Natural Gas (MMcf) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	14,510
Delaware Basin | Natural Gas (MMcf) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	9,125
Delaware Basin | Natural Gas (MMcf) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	9,150
Delaware Basin | Natural Gas (MMcf) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	57,075
Delaware Basin | Natural Gas (MMcf) [Member] | Supply Contract Expiration Date [Member]
Supply Commitment
Supply Commitments Contract Expiration Date	Mar. 31, 2031
Delaware Basin | Crude Oil (MBbls) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	26,298
Delaware Basin | Crude Oil (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	8,214
Delaware Basin | Crude Oil (MBbls) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	8,030
Delaware Basin | Crude Oil (MBbls) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	8,030
Delaware Basin | Crude Oil (MBbls) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	2,024
Delaware Basin | Crude Oil (MBbls) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	0
Delaware Basin | Crude Oil (MBbls) [Member] | Supply Contract Expiration Date [Member]
Supply Commitment
Supply Commitments Contract Expiration Date	Dec. 31, 2023
Appalachiain Basin | Natural Gas (MMcf) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	13,345
Appalachiain Basin | Natural Gas (MMcf) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	7,117
Appalachiain Basin | Natural Gas (MMcf) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	6,228
Appalachiain Basin | Natural Gas (MMcf) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	0
Appalachiain Basin | Natural Gas (MMcf) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	0
Appalachiain Basin | Natural Gas (MMcf) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	0
Appalachiain Basin | Natural Gas (MMcf) [Member] | Supply Contract Expiration Date [Member]
Supply Commitment
Supply Commitments Contract Expiration Date	Aug. 31, 2022