Quarterly report pursuant to Section 13 or 15(d)

Organization And Accounting Policies (Narrative) (Details)

v3.10.0.1
Organization And Accounting Policies (Narrative) (Details)
$ in Thousands, in Billions
3 Months Ended 9 Months Ended
Sep. 17, 2018
XAF ( )
Sep. 17, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
XAF ( )
/ $
Sep. 30, 2018
USD ($)
/ $
Dec. 31, 2017
USD ($)
Organization And Accounting Policies [Line Items]                  
Exchange rate | / $             565.129 565.129  
Recorded allowance     $ (159) $ (49) $ (68) $ 232      
Receivable balance, net                 $ 3,556
Transfers between levels     0 0 0 0      
Gains on foreign currency transactions     0 200 100 500      
Accrued liabilities               $ 17,662 12,991
Restatement Adjustment [Member]                  
Organization And Accounting Policies [Line Items]                  
ARO liability               (6,500)  
Gabon [Member]                  
Organization And Accounting Policies [Line Items]                  
Recorded allowance     $ 200 $ (100) $ 100 $ 200      
Receivable balance, gross |             6.9    
Receivable balance, net |             2.3    
Reduction of VAT receivable | 14.1                
Reduction of VAT receivable, net 4.7 $ 4,200              
SARs Liability [Member]                  
Organization And Accounting Policies [Line Items]                  
Accrued liabilities               2,100  
Other long-term liabilities                 $ 1,000
Derivative Liability Swaps [Member]                  
Organization And Accounting Policies [Line Items]                  
Accrued liabilities               $ 2,100