Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Segment Information (Long-lived Assets from Continuing Operations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Total assets $ 141,232 $ 211,537
Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 37,036 68,258
Total assets 141,232 211,537
Operating Segments [Member] | Gabon Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 26,832 57,930
Total assets 101,399 151,686
Operating Segments [Member] | Equatorial Guinea Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 10,000 10,000
Total assets 10,267 10,087
Corporate and Other [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 204 328
Total assets $ 29,566 $ 49,764