Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Feb. 28, 2017	Aug. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Cash consideration paid			$ 218,118	$ 196,956	$ 102,086
Assets acquired, unevaluated			78,093	59,460	50,224
Assets acquired, evaluated			140,025	137,496	51,862
Proceeds from sale of oil and gas properties, net			3,123	125	111,024
Gain on sale of oil and gas properties, net			$ 0	$ 0	94,551
Delaware Basin
Business Acquisition [Line Items]
Cash consideration paid		$ 29,200
Assets acquired, unevaluated		20,500
Assets acquired, evaluated		$ 8,700
Southern Delaware Basin
Business Acquisition [Line Items]
Proceeds from sale of oil and gas properties, net	$ 156,700
Proceeds from sale of oil and gas properties, cash portion	111,100
Proceeds from sale of oil and gas properties, value of shares	$ 45,600
Sale of oil and gas properties, percentage of total proved reserves	12.00%
Gain on sale of oil and gas properties, net					$ 94,600