Summary of Significant Accounting Policies (Major Components of Property and Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]
Unproved property costs - Dussafu PSC	$ 51,029	$ 50,324
Oilfield inventories	3,426	3,966
Other administrative property	2,777	2,670
Total property and equipment	57,232	56,960
Accumulated depreciation	(2,466)	(2,453)
TOTAL PROPERTY AND EQUIPMENT, NET	$ 54,766	$ 54,507