Investments in Affiliates (Details 2) - USD ($) $ in Thousands	9 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 8,080	$ 8,080	$ 34,010	$ 8,080
Total oil and gas properties, net	36,862	36,862	271,434	36,862
Non-current assets	51,929	51,929	276,881	51,929
Current liabilities	11,345	11,345	40,945	11,345
Non-current liabilities	32,168	32,168	193,911	32,168
Total members' equity	14,655	14,655	47,751	14,655
Revenues			53,051	22,473
Operating expenses			10,618	3,208
Net income			7,055	6,318
Carbon California [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	3,968	3,968	11,829	3,968
Total oil and gas properties, net	43,458	43,458	84,825	43,458
Non-current assets	44,759	44,759	89,173	44,759
Current liabilities	6,899	6,899	6,773	6,899
Non-current liabilities	23,279	23,279	56,664	23,279
Total members' equity	18,549	18,549	37,565	18,549
Revenues		7,235	32,317
Operating expenses		9,893	20,057
Income from operations		(2,658)	12,260
Net income		(6,552)	8,526
Carbon Appalachia [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	20,794	20,794	28,613	20,794
Total oil and gas properties, net	84,402	84,402	80,674	84,402
Non-current assets	97,762	97,762	96,814	97,762
Current liabilities	18,207	18,207	22,126	18,207
Non-current liabilities	59,420	59,420	58,480	59,420
Total members' equity	40,929	$ 40,929	44,821	$ 40,929
Revenues	31,584		83,541
Operating expenses	26,764		77,084
Income from operations	4,820		6,457
Net income	$ 3,005		$ 4,053