Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v2.4.0.6
Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 1 Months Ended 2 Months Ended 4 Months Ended 5 Months Ended 10 Months Ended 12 Months Ended
Feb. 13, 2012
Jan. 31, 2012
Feb. 28, 2010
Dec. 31, 2009
Aug. 31, 2009
Dec. 31, 2010
Dec. 31, 2011
Subsequent Event [Line Items]              
Company's purchase price agreement   $ 56.3          
Production barrels per day 1,000   3,000 3,000 3,000 2,300 2,000
Weighted average price (Bbls) 113.20           108.00
Grizzly Oil Sands ULC [Member]
              
Subsequent Event [Line Items]              
Approximate acres of oil sands leases agreement   46,700          
Affiliate purchase price agreement   $ 225.0