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Condensed Consolidated Statement of Changes in Members Capital - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Beginning Balance $ 52,104 $ 52,664 $ 13,505 $ 15,007 $ 52,664 $ 15,007 $ 15,007 $ 1,344
Net income (loss) (1,037) (560) (3,444) (1,502) (1,597) (4,946) (11,086) 12,068
Assignment of interest in Prometheus Energy by Member               1,595
Contribution in common control transaction             48,743  
Ending Balance 51,067 52,104 10,061 13,505 51,067 10,061 52,664 15,007
Member's Capital [Member]                
Beginning Balance $ 68,257 $ 68,257 $ 19,514 $ 19,514 $ 68,257 $ 19,514 $ 19,514 $ 20,000
Beginning Balance, shares 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000
Contribution in common control transaction             $ 48,743 $ (486)
Ending Balance $ 68,257 $ 68,257 $ 19,514 $ 19,514 $ 68,257 $ 19,514 $ 68,257 $ 19,514
Ending Balance, shares 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000
Accumulated Deficit [Member]                
Beginning Balance $ (17,654) $ (16,916) $ (7,576) $ (5,872) $ (16,916) $ (5,872) $ (5,872) $ (18,656)
Net income (loss) (1,066) (738) (3,287) (1,704)     (11,044) 12,784
Ending Balance (18,720) (17,654) (10,863) (7,576) (18,720) (10,863) (16,916) (5,872)
Parent [Member]                
Beginning Balance 50,603 51,341 11,938 13,642 51,341 13,642 13,642 1,344
Net income (loss) (1,066) (738) (3,287) (1,704)     (11,044) 12,784
Contribution in common control transaction             48,743 (486)
Ending Balance 49,537 50,603 8,651 11,938 49,537 8,651 51,341 13,642
Noncontrolling Interest [Member]                
Beginning Balance 1,502 1,323 1,567 1,365 1,323 1,365 1,365  
Net income (loss) 28 179 (157) 202     (42) (716)
Assignment of interest in Prometheus Energy by Member               1,595
Contribution in common control transaction               486
Ending Balance $ 1,530 $ 1,502 $ 1,410 $ 1,567 $ 1,530 $ 1,410 $ 1,323 $ 1,365