Quarterly report pursuant to Section 13 or 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
Mar. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Total assets $ 168,692 $ 211,537
Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 43,500 68,258
Total assets 168,692 211,537
Operating Segments [Member] | Gabon Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 33,202 57,930
Total assets 117,173 151,686
Operating Segments [Member] | Equatorial Guinea Segment [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 10,000 10,000
Total assets 10,112 10,087
Corporate and Other [Member] | Continuing Operations [Member]    
Segment Reporting Information [Line Items]    
Long lived assets 298 328
Total assets $ 41,407 $ 49,764