Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2021

Derivative Instruments Not Designated as Hedging Instruments [Abstract]

Schedule of notional amounts of outstanding derivative positions [Table Text Block]

As of December 31, 2021, the Company had commodity derivative contracts outstanding through the fourth quarter of 2023 as summarized in the table below.

	Contract Period
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	2022		2022		2022		2022		2023
Oil Derivatives (volumes in MBbl and prices in $ per Bbl):
Swaps
NYMEX WTI Volumes	2,009		1,953		1,938		1,923		1,190
Weighted-Average Contract Price	$	44.81	$	44.75	$	44.63	$	44.58	$	45.20
Collars
NYMEX WTI Volumes	896		894		868		584		858
Weighted-Average Floor Price	$	53.54	$	56.94	$	61.88	$	57.91	$	60.00
Weighted-Average Ceiling Price	$	63.73	$	64.93	$	66.54	$	61.61	$	73.09
Basis Swaps
WTI Midland-NYMEX WTI Volumes	2,222		2,374		2,442		2,462		—
Weighted-Average Contract Price	$	1.15	$	1.15	$	1.15	$	1.15	$	—
NYMEX WTI-ICE Brent Volumes	900		910		920		920		—
Weighted-Average Contract Price	$	(7.78)	$	(7.78)	$	(7.78)	$	(7.78)	$	—

	Contract Period
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	2022		2022		2022		2022		2023
Basis Swaps (continued)
WTI Houston MEH-NYMEX WTI Volumes	271		349		335		374		—
Weighted-Average Contract Price	$	1.25	$	1.25	$	1.25	$	1.25	$	—
Roll Differential Swaps
NYMEX WTI Volumes	2,907		2,841		2,782		2,748		1,832
Weighted-Average Contract Price	$	0.11	$	0.10	$	0.11	$	0.10	$	0.39
Gas Derivatives (volumes in BBtu and prices in $ per MMBtu):
Swaps
IF HSC Volumes	8,208		6,808		6,934		6,982		—
Weighted-Average Contract Price	$	2.85	$	2.34	$	2.37	$	2.47	$	—
IF WAHA Volumes	4,856		3,079		3,085		3,067		—
Weighted-Average Contract Price	$	2.63	$	2.09	$	2.19	$	2.22	$	—
IF Tenn TX Z0	513		—		—		—		—
Weighted-Average Contract Price	$	3.22	$	—	$	—	$	—	$	—
Collars
NYMEX HH Volumes	859		1,270		760		1,908		2,601
Weighted-Average Floor Price	$	4.00	$	3.00	$	3.25	$	3.50	$	3.00
Weighted-Average Ceiling Price	$	8.02	$	4.48	$	5.45	$	4.44	$	8.76
IF HSC Volumes	—		—		—		—		900
Weighted-Average Floor Price	$	—	$	—	$	—	$	—	$	3.38
Weighted-Average Ceiling Price	$	—	$	—	$	—	$	—	$	7.75
Basis Swaps
IF Tenn TX Z0-NYMEX HH Volumes	859		1,270		760		—		—
Weighted-Average Contract Price	$	0.12	$	(0.14)	$	(0.14)	$	—	$	—
IF WAHA-NYMEX HH	—		—		—		—		1,849
Weighted-Average Contract Price	$	—	$	—	$	—	$	—	$	(0.48)
NGL Derivatives (volumes in MBbl and prices in $ per Bbl):
Swaps
OPIS Propane Mont Belvieu Non-TET Volumes	351		116		55		58		—
Weighted-Average Contract Price	$	28.67	$	33.03	$	29.44	$	29.63	$	—
Collars
OPIS Propane Mont Belvieu Non-TET Volumes	180		253		164		173		—
Weighted-Average Floor Price	$	28.68	$	25.94	$	24.09	$	24.11	$	—
Weighted-Average Ceiling Price	$	38.25	$	31.69	$	27.84	$	28.13	$	—

Schedule of fair value of derivatives in accompanying balance sheets [Table Text Block]

The following table details the fair value of commodity derivative contracts recorded in the accompanying balance sheets, by category:

	As of December 31, 2021		As of December 31, 2020
	(in thousands)
Derivative assets:
Current assets	$	24,095	$	31,203
Noncurrent assets	239		23,150
Total derivative assets	$	24,334	$	54,353
Derivative liabilities:
Current liabilities	$	319,506	$	200,189
Noncurrent liabilities	25,696		22,331
Total derivative liabilities	$	345,202	$	222,520

Schedule of the potential effects of master netting arrangements [Table Text Block]

The following table provides a reconciliation between the gross assets and liabilities reflected on the accompanying balance sheets and the potential effects of master netting arrangements on the fair value of the Company’s commodity derivative contracts:

	Derivative Assets as of				Derivative Liabilities as of
	December 31, 2021		December 31, 2020		December 31, 2021		December 31, 2020
	(in thousands)
Gross amounts presented in the accompanying balance sheets	$	24,334	$	54,353	$	(345,202)	$	(222,520)
Amounts not offset in the accompanying balance sheets	(22,862)		(53,598)		22,862		53,598
Net amounts	$	1,472	$	755	$	(322,340)	$	(168,922)

Schedule of the components of the derivative settlement (gain) loss and the net derivative (gain) loss [Table Text Block]

	For the Years Ended December 31,
	2021		2020		2019
	(in thousands)
Derivative settlement (gain) loss:
Oil contracts	$	523,245	$	(331,559)	$	19,685
Gas contracts	152,361		(11,898)		(23,008)
NGL contracts	73,352		(7,804)		(35,899)
Total derivative settlement (gain) loss:	$	748,958	$	(351,261)	$	(39,222)
Net derivative (gain) loss:
Oil contracts	$	650,959	$	(205,180)	$	172,055
Gas contracts	172,248		30,038		(41,205)
NGL contracts	78,452		13,566		(33,311)
Total net derivative (gain) loss:	$	901,659	$	(161,576)	$	97,539