Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Segment Information (Long-lived Assets from Continuing Operations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Total assets $ 211,537 $ 166,312
Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 68,258 52,724
Total assets 211,537 163,022
Operating Segments [Member] | Gabon Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 57,930 42,195
Total assets 151,686 103,401
Operating Segments [Member] | Equatorial Guinea Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 10,000 10,187
Total assets 10,087 10,320
Corporate and Other [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 328 342
Total assets $ 49,764 $ 49,301