Segment Reporting (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment	2
Revenues	$ 1,026,204,000	$ 829,691,000
Lease bonus - mineral acreage	1,711,000	2,489,000	$ 0
Realized gain on derivatives	9,482,000	2,334,000	(4,321,000)
Unrealized gain on derivatives	(53,727,000)	65,085,000	9,715,000
Expenses	748,190,000	536,328,000	383,435,000
Operating income	235,480,000	363,271,000	160,841,000
Assets	4,069,676,000	3,455,518,000	2,145,690,000
Capital expenditures	946,025,000	1,504,659,000	872,958,000
Depletion, depreciation and amortization	350,540,000	265,142,000	177,502,000
Income (loss) attributable to noncontrolling interest	35,205,000	25,557,000	12,140,000
Impairment charge of net capitalized costs	0	0	0
Other (expense) income	(2,126,000)	1,551,000	3,551,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	158,514,000	292,073,000	129,850,000
Total income tax provision	35,532,000	(7,691,000)	(8,157,000)
Net (loss) income	122,982,000	299,764,000	138,007,000
Net Income (Loss) Attributable to Parent	87,777,000	274,207,000	125,867,000
Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Lease bonus - mineral acreage	1,711,000	2,489,000
Realized gain on derivatives	9,482,000	2,334,000	(4,321,000)
Unrealized gain on derivatives	(53,727,000)	65,085,000	9,715,000
Expenses	621,687,000	487,539,000	333,923,000
Operating income	226,708,000	377,532,000	197,333,000
Assets	3,360,725,000	2,910,326,000	1,768,393,000
Capital expenditures	718,712,000	1,335,690,000	753,157,000
Depletion, depreciation and amortization	331,700,000	252,300,000	170,500,000
Payments to acquire productive assets		656,900,000
Operating Segments | Midstream
Segment Reporting Information [Line Items]
Lease bonus - mineral acreage	0	0
Realized gain on derivatives	0	0	0
Unrealized gain on derivatives	0	0	0
Expenses	130,612,000	44,098,000	23,420,000
Operating income	81,506,000	55,247,000	26,439,000
Assets	647,937,000	439,953,000	257,871,000
Capital expenditures	223,612,000	166,407,000	114,113,000
Depletion, depreciation and amortization	16,100,000	10,500,000	5,200,000
Income (loss) attributable to noncontrolling interest	35,200,000	25,600,000	12,100,000
Land and seismic acquisition expenditures	48,300,000
Payments to acquire productive assets	145,400,000	80,200,000	54,900,000
Corporate
Segment Reporting Information [Line Items]
Lease bonus - mineral acreage	0	0
Realized gain on derivatives	0	0	0
Unrealized gain on derivatives	0	0	0
Expenses	72,734,000	69,508,000	62,931,000
Operating income	(72,734,000)	(69,508,000)	(62,931,000)
Assets	61,014,000	105,239,000	119,426,000
Capital expenditures	3,701,000	2,562,000	5,688,000
Depletion, depreciation and amortization	2,700,000	2,400,000	1,700,000
Consolidations and Eliminations
Segment Reporting Information [Line Items]
Lease bonus - mineral acreage	0	0
Realized gain on derivatives	0	0	0
Unrealized gain on derivatives	0	0	0
Expenses	(76,843,000)	(64,817,000)	(36,839,000)
Operating income	0	0	0
Assets	0	0	0
Capital expenditures	0	0	0
Oil and natural gas revenues
Segment Reporting Information [Line Items]
Revenues	892,325,000	800,700,000	528,684,000
Oil and natural gas revenues | Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Revenues	886,127,000	794,261,000	525,862,000
Oil and natural gas revenues | Operating Segments | Midstream
Segment Reporting Information [Line Items]
Revenues	6,198,000	6,439,000	2,822,000
Oil and natural gas revenues | Corporate
Segment Reporting Information [Line Items]
Revenues	0	0	0
Oil and natural gas revenues | Consolidations and Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	0
Third-party midstream services revenues
Segment Reporting Information [Line Items]
Revenues	59,110,000	21,920,000	10,198,000
Third-party midstream services revenues | Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Revenues	0	0	0
Third-party midstream services revenues | Operating Segments | Midstream
Segment Reporting Information [Line Items]
Revenues	135,953,000	86,737,000	47,037,000
Third-party midstream services revenues | Corporate
Segment Reporting Information [Line Items]
Revenues	0	0	0
Third-party midstream services revenues | Consolidations and Eliminations
Segment Reporting Information [Line Items]
Revenues	(76,843,000)	(64,817,000)	(36,839,000)
Sales of purchased natural gas
Segment Reporting Information [Line Items]
Revenues	74,769,000	7,071,000	$ 0
Sales of purchased natural gas | Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Revenues	4,802,000	902,000
Sales of purchased natural gas | Operating Segments | Midstream
Segment Reporting Information [Line Items]
Revenues	69,967,000	6,169,000
Sales of purchased natural gas | Corporate
Segment Reporting Information [Line Items]
Revenues	0	0
Sales of purchased natural gas | Consolidations and Eliminations
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0