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Condensed Consolidated Statements of Changes in Partnership Capital (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
General Partner [Member]
Limited Partner [Member]
Total
Balance at Dec. 31, 2018 $ 1,826 $ 84,821 $ 86,647
Balance (in shares) at Dec. 31, 2018   32,280  
Net income 1,364 $ 39,078 40,442
Distributions (1,708) (51,262) (52,970)
Acquisition of assets for units 0 $ 43,824 43,824
Acquisition of assets for units (in shares)   2,400  
Balance at Sep. 30, 2019 1,482 $ 116,461 117,943
Balance (in shares) at Sep. 30, 2019   34,680  
Balance at Jun. 30, 2019 1,611 $ 121,918 123,529
Balance (in shares) at Jun. 30, 2019   34,680  
Net income 463 $ 12,404 12,867
Distributions (592) (17,861) (18,453)
Balance at Sep. 30, 2019 1,482 $ 116,461 117,943
Balance (in shares) at Sep. 30, 2019   34,680  
Balance at Dec. 31, 2019 1,228 $ 111,108 112,336
Balance (in shares) at Dec. 31, 2019   34,680  
Net income 490 $ 15,082 15,572
Distributions (1,099) (36,950) (38,049)
Balance at Sep. 30, 2020 619 $ 89,240 89,859
Balance (in shares) at Sep. 30, 2020   34,680  
Balance at Jun. 30, 2020 629 $ 91,662 92,291
Balance (in shares) at Jun. 30, 2020   34,680  
Net income 192 $ 5,427 5,619
Distributions (202) (7,849) (8,051)
Balance at Sep. 30, 2020 $ 619 $ 89,240 $ 89,859
Balance (in shares) at Sep. 30, 2020   34,680