Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Segment Activity) (Details)

v3.19.3
Segment Information (Segment Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Revenues-oil and natural gas sales $ 17,603 $ 25,266 $ 62,598 $ 77,337  
Depreciation, depletion and amortization 1,509 1,130 4,971 3,289  
Gain on revision of asset retirement obligations   (3,325)   (3,325) $ 6,527
Other operating income (expense), net 35 (6) (4,401) 332  
Operating income (loss) 1,501 17,320 13,417 36,081  
Derivative instruments loss, net 2,267 (1,026) 2,266 (2,036)  
Other, net (138) (3) (521) (148)  
Interest income (expense), net 193 111 581 (273)  
Income tax expense (benefit) 7,681 (62,224) 19,642 (54,600)  
Additions to oil and natural gas properties and equipment - accrual 6,112 36,598 8,419 37,567  
Operating Segments | Gabon Segment [Member]          
Segment Reporting Information [Line Items]          
Revenues-oil and natural gas sales 17,603 25,265 62,598 77,333  
Depreciation, depletion and amortization 1,437 1,065 4,751 3,095  
Gain on revision of asset retirement obligations   (3,325)   (3,325)  
Other operating income (expense), net     (4,436) 332  
Operating income (loss) 6,048 19,826 24,541 45,670  
Other, net     (333) (127)  
Interest income (expense), net     4 (397)  
Income tax expense (benefit) 4,774 (42,141) 15,134 (34,517)  
Additions to oil and natural gas properties and equipment - accrual 6,112 36,595 8,386 37,550  
Operating Segments | Equatorial Guinea Segment [Member]          
Segment Reporting Information [Line Items]          
Operating income (loss) (54) (159) (370) (274)  
Other, net     (4) (3)  
Income tax expense (benefit)     12    
Additions to oil and natural gas properties and equipment - accrual     (187)    
Corporate and Other          
Segment Reporting Information [Line Items]          
Revenues-oil and natural gas sales   1   4  
Depreciation, depletion and amortization 72 65 220 194  
Other operating income (expense), net     35    
Operating income (loss) (4,493) (2,347) (10,754) (9,315)  
Derivative instruments loss, net 2,267 (1,026) 2,266 (2,036)  
Other, net     (184) (18)  
Interest income (expense), net     577 124  
Income tax expense (benefit) $ 2,907 (20,083) 4,496 (20,083)  
Additions to oil and natural gas properties and equipment - accrual   $ 3 $ 220 $ 17