Oil and Gas Producing Activities (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Oil and Gas Exploration and Production Industries Disclosures [Abstract]

Cost Incurred in Oil and Gas Exploration and Development Activities

Total costs incurred in crude oil and natural gas exploration and development activities, all within the U.S., were as follows for the period from January 1, 2017 through April 30, 2017 (in thousands):

Property acquisition costs:
Unproved	$	4
Exploration costs:
Expensed	5
Development costs	1,815
Total costs incurred	$	1,824

Proved Developed and Undeveloped Oil and Gas Reserves

Proved developed and undeveloped reserves were as follows for the period from January 1, 2017 through April 30, 2017 (in thousands):

	Natural	Crude
	Gas	Oil
	(Mcf)	(Bbls)
Total proved reserves:
Beginning of period	4,214	187
Crude oil and natural gas reserves sold	(4,067)	(170)
Extensions, discoveries and other reserve additions	42	6
Production	(189)	(23)
End of period	—	—

Principal Sources of Changes in the Standardized Measure of Discounted Future Net Flows

The principal sources of changes in the standardized measure of discounted future net cash flows were as follows for the period from January 1, 2017 through April 30, 2017 (in thousands):

Beginning of period	$	2,260
Sale of crude oil and natural gas reserves	(2,732)
New field discoveries and extensions, net of future production costs	94
Sales of crude oil and natural gas produced, net of production costs	(476)
Accretion of discount	130
Production rate changes and other	(493)
Net change in income taxes	1,217
End of period	$	—

Results of Operations for Oil and Gas Producing Activities

The results of crude oil and natural gas producing activities, excluding corporate overhead and interest costs, were as follows for the period from January 1, 2017 through April 30, 2017 (in thousands):

Revenues	$	1,427
Costs and expenses:
Production	(951)
Depreciation, depletion and amortization	(423)
Operating earnings before income taxes	53
Income tax expense	(19)
Operating earnings	$	34