Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Long-lived Assets from Continuing Operations) (Details)

v3.20.2
Segment Information (Long-lived Assets from Continuing Operations) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Total assets $ 147,657 $ 211,537
Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 41,348 68,258
Total assets 147,657 211,537
Operating Segments [Member] | Gabon Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 31,080 57,930
Total assets 118,369 151,686
Operating Segments [Member] | Equatorial Guinea Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 10,000 10,000
Total assets 10,086 10,087
Corporate and Other [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 268 328
Total assets $ 19,202 $ 49,764