Libyan Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 boepd	Dec. 31, 2010 boepd
Libyan Operations (Textual) [Abstract]
The Corporation's proved reserves in Libya (in B.O.E)	166,000,000
Libyan Operations [Member]
Libyan Operations (Textual) [Abstract]
The average production in Libya (in boepd)	4,000	23,000
The net book value of the Corporation's assets in Libya	$ 500