Commitments and Contingencies Commitments and Contigencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) MMcf MBbls
Supply Commitment
Dollar Commitment ($ in thousands) | $	$ 808,306
First Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	139,258
Second Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	128,413
Third Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	133,551
Fourth Year Commitment [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	112,411
commitments 5 years and beyond [Member]
Supply Commitment
Dollar Commitment ($ in thousands) | $	$ 294,673
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	532,509
Natural Gas (MMcf) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	104,449
Natural Gas (MMcf) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	96,110
Natural Gas (MMcf) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	75,877
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	182,825
Crude Oil (MBbls) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	155,151
Crude Oil (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	22,283
Crude Oil (MBbls) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	24,537
Crude Oil (MBbls) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	29,748
Crude Oil (MBbls) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	22,787
Crude Oil (MBbls) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	55,796
Wattenberg Field | Natural Gas (MMcf) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	374,789
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	118,925
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	124,461
Wattenberg Field | Crude Oil (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	13,703
Wattenberg Field | Crude Oil (MBbls) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	16,507
Wattenberg Field | Crude Oil (MBbls) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	21,718
Wattenberg Field | Crude Oil (MBbls) [Member] | Fourth Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	16,737
Wattenberg Field | Crude Oil (MBbls) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	55,796
Wattenberg Field | Crude Oil (MBbls) [Member] | Supply Contract Expiration Date [Member]
Supply Commitment
Supply Commitments Contract Expiration Date	Mar. 31, 2029
Wattenberg Field | Water (MBbls) [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	29,520
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	6,223
Wattenberg Field | Water (MBbls) [Member] | commitments 5 years and beyond [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	4,676
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	140,807
Delaware Basin | Natural Gas (MMcf) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	33,410
Delaware Basin | Natural Gas (MMcf) [Member] | Second Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	25,222
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	63,900
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	30,690
Delaware Basin | Crude Oil (MBbls) [Member] | First Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes | MBbls	8,580
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	6,050
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	16,913
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	6,966
Appalachiain Basin | Natural Gas (MMcf) [Member] | Third Year Commitment [Member]
Supply Commitment
Oil and Gas Delivery Commitments Volumes	2,830
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