Supplemental Oil and Natural Gas Disclosures - Estimated Net Quantities of Partnership Proved, Proved Developed and Proved Undeveloped Oil and Natural Gas Reserve (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) MBoe MMcf MBbls	Dec. 31, 2018 USD ($) MBoe MMcf MBbls	Dec. 31, 2017 USD ($) MBoe MBbls MMcf	Dec. 31, 2016 USD ($) MBoe
Reserve Quantities [Line Items]
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves | $	$ 847,894	$ 1,087,616	$ 862,649	$ 603,015
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at the beginning of the period	69,904	67,945	63,425
Revisions of previous estimates	4,140	(1,873)	120
Purchases of minerals in place	92	297	7,555
Extensions, discoveries and other additions	12,123	20,434	10,360
Production	(17,716)	(16,899)	(13,515)
Balance at the end of the period	68,543	69,904	67,945
Net proved developed reserves	60,945	63,939	56,727
Net Proved Undeveloped Reserves	7,598	5,965	11,218
Noncontrolling Interest
Reserve Quantities [Line Items]
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves | $			$ 500
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]
Net proved developed reserves	0	0	61
Net Proved Undeveloped Reserves		0	0	0
Crude Oil
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at the beginning of the period | MBbls	17,567	17,899	18,368
Revisions of previous estimates | MBbls	951	(35)	(2,298)
Purchases of minerals in place | MBbls	46	227	2,335
Extensions, discoveries and other additions | MBbls	3,263	4,438	3,046
Production | MBbls	(4,777)	(4,962)	(3,552)
Balance at the End of the period | MBbls	17,050	17,567	17,899
Net proved developed reserves | MBbls	17,050	17,567	17,891
Net proved undeveloped reserves | MBbls	0	0	8
Natural Gas Reserves
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at the beginning of the period | MMcf	314,020	300,274	270,339
Revisions of previous estimates | MMcf	19,136	(11,027)	14,505
Purchases of minerals in place | MMcf	279	419	31,323
Extensions, discoveries and other additions | MMcf	53,158	95,976	43,886
Production | MMcf	(77,635)	(71,622)	(59,779)
Balance at the End of the period | MMcf	308,958	314,020	300,274
Net proved developed reserves | MMcf	263,371	278,233	233,017
Net proved undeveloped reserves | MMcf	45,587	35,787	67,257