Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Oct. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Oil and natural gas interests, based on the full cost method of accounting, amount excluded from depletion		$ 1,452,248	$ 1,551,767
Common Units
Limited partners' capital account, units issued (in shares)		67,850,632	67,805,707
Limited partners' capital account, units outstanding (in shares)		67,850,632	67,805,707
Class B Units
Limited partners' capital account, units issued (in shares)		90,709,946	90,709,946
Limited partners' capital account, units outstanding (in shares)	90,709,946	90,709,946	90,709,946