Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Oil and natural gas properties
Evaluated (subject to amortization)	$ 3,780,236	$ 3,004,770
Total unproved and unevaluated	1,199,511	637,396
Total oil and natural gas properties	4,979,747	3,642,166
Accumulated depletion	(2,273,010)	(2,021,169)
Net oil and natural gas properties	2,706,737	1,620,997
Other property and equipment
Midstream and other property and equipment	450,066	281,096
Accumulated depreciation	(33,939)	(20,637)
Net other property and equipment	416,127	260,459
Net property and equipment	3,122,864	1,881,456
Midstream equipment and facilities
Other property and equipment
Midstream and other property and equipment	424,480	258,725
Furniture, fixtures and other equipment
Other property and equipment
Midstream and other property and equipment	7,184	6,109
Software
Other property and equipment
Midstream and other property and equipment	8,039	7,942
Land
Other property and equipment
Midstream and other property and equipment	4,192	2,892
Leasehold improvements
Other property and equipment
Midstream and other property and equipment	$ 6,171	$ 5,428