Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 402,039	$ 271,059	$ 1,150,558	$ 825,209
E&P
Disaggregation of Revenue [Line Items]
Total revenues	335,327	215,636	947,013	668,849
E&P | Crude oil revenues
Disaggregation of Revenue [Line Items]
Total revenues	205,731	155,052	598,278	448,904
E&P | Purchased crude oil sales
Disaggregation of Revenue [Line Items]
Total revenues	53,562	35,442	163,785	144,719
E&P | Natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenues	75,905	24,525	184,046	63,631
E&P | Purchased natural gas sales
Disaggregation of Revenue [Line Items]
Total revenues	8	308	362	4,909
E&P | Other services revenues
Disaggregation of Revenue [Line Items]
Total revenues	121	309	542	6,686
Midstream Total
Disaggregation of Revenue [Line Items]
Total revenues	66,712	55,423	203,545	156,360
Midstream Total | Purchased crude oil sales
Disaggregation of Revenue [Line Items]
Total revenues	0	8,444	19,738	18,196
Midstream Total | Crude oil, natural gas and NGL revenues
Disaggregation of Revenue [Line Items]
Total revenues	22,111	22,682	65,225	72,267
Midstream Total | Produced and flowback water revenues
Disaggregation of Revenue [Line Items]
Total revenues	10,312	8,801	25,230	27,300
Midstream Total | Total midstream service revenues
Disaggregation of Revenue [Line Items]
Total revenues	32,423	31,483	90,455	99,567
Midstream Total | Crude oil, natural gas and NGL revenues
Disaggregation of Revenue [Line Items]
Total revenues	33,845	15,100	91,671	35,707
Midstream Total | Freshwater revenues
Disaggregation of Revenue [Line Items]
Total revenues	444	396	1,681	2,890
Midstream Total | Total midstream product revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 34,289	$ 23,940	$ 113,090	$ 56,793