CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Total revenue	$ 88,874	$ 286,810	$ 276,638	$ 465,523
Operating expenses:
Depreciation, depletion and amortization	88,443	95,806	181,986	160,393
Write-down of oil and natural gas properties		12,361	57	12,361
Accretion expense	13,794	9,945	26,211	19,552
General and administrative expense	17,192	18,865	44,661	36,474
Total operating expenses	183,477	191,938	375,453	352,282
Operating income (expense)	(94,603)	94,872	(98,815)	113,241
Interest expense	(26,190)	(24,932)	(52,040)	(50,150)
Price risk management activities income (expense)	(68,682)	29,990	174,535	(79,589)
Other income (expense)	(528)	831	(674)	1,264
Net income (loss) before income taxes	(190,003)	100,761	23,006	(15,234)
Income tax benefit (expense)	49,392	(5,997)	(5,868)	362
Net income (loss)	$ (140,611)	$ 94,764	$ 17,138	$ (14,872)
Net income (loss) per common share:
Basic	$ (2.14)	$ 1.75	$ 0.28	$ (0.27)
Diluted	$ (2.14)	$ 1.74	$ 0.28	$ (0.27)
Weighted average common shares outstanding:
Basic	65,807	54,178	62,023	54,167
Diluted	65,807	54,451	62,318	54,167
Oil and Gas Properties
Operating expenses:
Lease operating expense	$ 63,882	$ 54,455	$ 122,123	$ 122,414
Production taxes	166	506	415	1,088
Oil Revenue
Revenues:
Revenue	74,471	256,908	241,095	412,587
Natural Gas Revenue
Revenues:
Revenue	11,140	14,746	23,038	29,193
NGL Revenue
Revenues:
Revenue	1,964	6,645	6,265	11,711
Other
Revenues:
Revenue	$ 1,299	$ 8,511	$ 6,240	$ 12,032