Annual report pursuant to Section 13 and 15(d)

Segment Information (Details)

v2.4.0.6
Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment activity                      
Revenues, Net $ 53,553 $ 37,630 $ 58,818 $ 45,286 $ 67,767 $ 37,350 $ 58,547 $ 46,772 $ 195,287 $ 210,436 $ 134,472
Depreciation, depletion and amortization                 19,913 25,596 20,021
Operating income (loss) 2,261 15,594 38,632 30,106 38,888 19,819 42,512 31,342 86,593 132,561 78,123
Interest income                 145 184 151
Income taxes                 81,813 93,468 35,260
Bad debt expenses                 1,621 4,448  
Impairment of proved properties                 7,620 4,975  
Additions to properties and equipment                 46,366 32,966 40,452
Long lived assets 106,608       99,848       106,608 99,848  
Total assets 267,956       275,015       267,956 275,015 238,400
Corporate and Other [Member]
                      
Segment activity                      
Depreciation, depletion and amortization                 59 50 48
Operating income (loss)                 (8,124) (8,706) (3,813)
Interest income                 86 104 66
Additions to properties and equipment                 77 60 83
Long lived assets 166       147       166 147  
Total assets 38,585       45,986       38,585 45,986 39,488
Gabon [Member]
                      
Segment activity                      
Revenues, Net                 192,489 208,781 134,346
Depreciation, depletion and amortization                 15,954 23,604 19,946
Operating income (loss)                 147,985 155,550 85,594
Interest income                 60 80 85
Income taxes                 81,813 93,468 35,260
Additions to properties and equipment                 22,731 8,528 38,082
Long lived assets 71,225       68,965       71,225 68,965  
Total assets 190,652       185,341       190,652 185,341 181,642
Angola [Member]
                      
Segment activity                      
Depreciation, depletion and amortization                 28 20 16
Operating income (loss)                 (3,293) (6,221) (2,846)
Interest income                 (1)    
Bad debt expenses                 1,621 4,448  
Additions to properties and equipment                   7 27
Long lived assets 10,938       10,964       10,938 10,964  
Total assets 11,405       21,452       11,405 21,452 14,081
Equatorial Guinea [Member]
                      
Segment activity                      
Operating income (loss)                 (754)    
Additions to properties and equipment                 10,000    
Long lived assets 10,000               10,000    
Total assets 10,000               10,000    
North Sea [Member]
                      
Segment activity                      
Operating income (loss)                 (281) (382) (425)
USA [Member]
                      
Segment activity                      
Revenues, Net                 2,798 1,655 126
Depreciation, depletion and amortization                 3,872 1,922 11
Operating income (loss)                 (48,940) (7,680) (387)
Impairment of proved properties                 7,620 4,975  
Additions to properties and equipment                 13,558 24,371 2,260
Long lived assets 14,279       19,772       14,279 19,772  
Total assets $ 17,314       $ 22,236       $ 17,314 $ 22,236 $ 3,189