Summary of Property and Equipment (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) $ / bbl	Jun. 30, 2018 USD ($) $ / bbl	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Abstract]
Proved Oil and Gas Property, Full Cost Method	$ 1,224,547		$ 1,037,993
Unproved Oil and Gas Property, Full Cost Method	66,419		63,484
Oil and Gas Property, Full Cost Method, Gross	1,290,966		1,101,477
Other property and equipment	24,588		20,383
Total properties and equipment	1,315,554		1,121,860
Accumulated depreciation, depletion and amortization	(276,867)		(193,866)
Property and equipment, net (successful efforts method)	1,038,687		927,994
Unproved Oil and Gas Property excluded	66,400		63,500
Capitalized Exploratory Well Costs	4,200		$ 300
Undeveloped Leasehold Costs Transferred	100	$ 5,600
Capitalized Costs, Proved Properties	2,200	1,600
Interest Costs Capitalized	$ 2,200	$ 4,700
Amortization Expense Per Physical Unit of Production | $ / bbl	17.49	15.36