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
Sep. 30, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Total assets $ 135,437 $ 211,537
Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 38,845 68,258
Total assets 135,437 211,537
Operating Segments [Member] | Gabon Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 28,614 57,930
Total assets 87,954 151,686
Operating Segments [Member] | Equatorial Guinea Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 10,000 10,000
Total assets 10,116 10,087
Corporate and Other [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 231 328
Total assets $ 37,367 $ 49,764