Oil and Gas Reserve Information - Summary of Proved Developed and Undeveloped Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Discounted future net cash flows	$ 140,016	$ 319,232	$ 216,393	$ 141,427
Company
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future net cash flows	833	398	1,802
Production	509	123	902
Development and abandonment	37	35	0
Income taxes	0	0	0
Future net cash flows	287	240	900
10% discount factor	(106)	(110)	(328)
Discounted future net cash flows	181	130	572	285
Company's Share of Laramie Energy
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future net cash flows	669,271	1,283,890	1,026,005
Production	398,193	583,112	491,748
Development and abandonment	25,277	93,546	109,248
Income taxes	0	0	0
Future net cash flows	245,801	607,232	425,009
10% discount factor	(105,966)	(288,130)	(209,188)
Discounted future net cash flows	$ 139,835	$ 319,102	$ 215,821	$ 141,142