Commitments and Contingencies Commitments and Contigencies (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) MBbls MMcf
Supply Commitment
Dollar Commitment ($ in thousands) | $	$ 593,429
First Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	138,697
Second Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	119,050
Third Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	105,066
Fourth Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	80,073
commitments 5 years and beyond [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	$ 150,543
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	505,387
Natural Gas (MMcf) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	100,365
Natural Gas (MMcf) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	83,842
Natural Gas (MMcf) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	74,194
Natural Gas (MMcf) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	73,223
Natural Gas (MMcf) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	173,763
Crude Oil (MBbls) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	106,525
Crude Oil (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	24,730
Crude Oil (MBbls) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	24,036
Crude Oil (MBbls) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	22,445
Crude Oil (MBbls) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	13,930
Crude Oil (MBbls) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	21,384
Wattenberg Field | Natural Gas (MMcf) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	358,853
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	63,923
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	102,988
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	78,019
Wattenberg Field | Crude Oil (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	16,332
Wattenberg Field | Crude Oil (MBbls) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	16,006
Wattenberg Field | Crude Oil (MBbls) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	14,415
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	21,384
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	27,973
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	6,207
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	3,128
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	131,396
Delaware Basin | Natural Gas (MMcf) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	29,326
Delaware Basin | Natural Gas (MMcf) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	13,045
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	9,125
Delaware Basin | Natural Gas (MMcf) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	70,775
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	28,506
Delaware Basin | Crude Oil (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	8,398
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	4,048
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	15,138
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	6,874
Appalachiain Basin | Natural Gas (MMcf) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	1,147
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