4. SEGMENT INFORMATION

Our operations are based in Gabon and Equatorial Guinea. Each of our two reportable operating segments is organized and managed based upon geographic location. Our Chief Executive Officer, who is the chief operating decision maker, and management review and evaluate the operation of each geographic segment separately primarily based on Operating income (loss). The operations of all segments include exploration for and production of hydrocarbons where commercial reserves have been found and developed. Revenues are based on the location of hydrocarbon production. Corporate and other is primarily corporate and operations support costs which are not allocated to the reportable operating segments.

Segment activity of continuing operations for the three and nine months ended September 30, 2018 and 2017 as well as long-lived assets and segment assets at September 30, 2018 and December 31, 2017 are as follows:


	Three Months Ended September 30, 2018
(in thousands)	Gabon		Equatorial Guinea		Corporate and Other		Total
Revenues-oil and natural gas sales	$	25,265	$	—	$	1	$	25,266
Operating income (loss)		19,826		(159)		(2,347)		17,320
Other, net		3		—		(1,032)		(1,029)
Income tax expense (benefit)		(42,141)		—		(20,083)		(62,224)
Additions to property and equipment - accrual		17,983		—		3		17,986


	Nine Months Ended September 30, 2018
(in thousands)	Gabon		Equatorial Guinea		Corporate and Other		Total
Revenues-oil and natural gas sales	$	77,333	$	—	$	4	$	77,337
Operating income (loss)		45,670		(274)		(9,315)		36,081
Other, net		(127)		(3)		(2,054)		(2,184)
Income tax expense (benefit)		(34,517)		—		(20,083)		(54,600)
Additions to property and equipment - accrual		18,938		—		17		18,955


	Three Months Ended September 30, 2017
(in thousands)	Gabon		Equatorial Guinea		Corporate and Other		Total
Revenues-oil and natural gas sales	$	18,162	$	—	$	16	$	18,178
Operating income (loss)		6,067		(44)		(2,302)		3,721
Other, net		142		4		(939)		(793)
Income tax expense (benefit)		2,749		—		—		2,749
Additions to property and equipment - accrual		237		—		60		297


	Nine Months Ended September 30, 2017
(in thousands)	Gabon		Equatorial Guinea		Corporate and Other		Total
Revenues-oil and natural gas sales	$	59,823	$	—	$	46	$	59,869
Operating income (loss)		25,117		(97)		(7,564)		17,456
Other, net		441		13		(1,025)		(571)
Income tax expense (benefit)		9,039		—		—		9,039
Additions to property and equipment - accrual		1,051		—		60		1,111



(in thousands)	Gabon		Equatorial Guinea		Corporate and Other		Total
Long-lived assets from continuing operations:
Balance at September 30, 2018	$	24,526	$	10,000	$	405	$	34,931
Balance at December 31, 2017		12,638		10,000		583		23,221

Assets from continuing operations:
Balance at September 30, 2018	$	104,574	$	10,088	$	44,477	$	159,139
Balance at December 31, 2017		63,122		10,095		3,580		76,797

Information about our most significant customers

For the period from August of 2015 through September 2018, we sold our crude oil production from Gabon under a term contract with Glencore Energy UK Ltd. (“Glencore”) with pricing based upon an average of Dated Brent in the month of lifting, adjusted for location and market factors. The contract with Glencore ends in January 2019. Sales of oil to Glencore were approximately 100% of total revenues for the three and nine months ended September 30, 2018 and 2017. We expect to be able to enter into a new contract with Glencore or other third party on competitive terms prior to the expiration of the current contract.