Oil and Natural Gas Properties Acquisitions - 2019 Acquisitions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 44,000	$ 149,900
Acquisition-related costs	100	200
Issuance of common units, net of offering costs	(43)	40,537	$ 32,458
East Texas
Business Acquisition [Line Items]
Asset acquisition payments to acquire oil mineral and royalty interests	31,600	$ 58,200
2019 Acquisitions
Business Acquisition [Line Items]
Asset acquisition payments to acquire oil mineral and royalty interests	30,700
Issuance of common units, net of offering costs	$ 900