Information Regarding Proved Oil and Gas Reserves (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Discounted future net cash flows	$ 143,178	$ 40,193	$ 172,365	$ 92,862
Company
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future net cash flows	1,154	690	10,452
Production	713	345	7,760
Development and abandonment	2	25	37
Income taxes	0	0	0
Future net cash flows	439	320	2,655
10% discount factor	(154)	(128)	(889)
Discounted future net cash flows	285	192	1,766	3,537
Company's Share of Laramie Energy
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future net cash flows	955,090	425,596	1,268,704
Production	488,977	249,831	539,796
Development and abandonment	148,708	72,462	236,027
Income taxes	0	0	0
Future net cash flows	317,405	103,303	492,881
10% discount factor	(174,512)	(63,302)	(322,282)
Discounted future net cash flows	$ 142,893	$ 40,001	$ 170,599	$ 89,325