Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies [Abstract]

Contractual Obligations Future Lease Payments

The following is a schedule by year of purchase obligations, future minimum payments for firm agreements and leases that have initial or remaining non-cancellable lease terms in excess of one year as of December 31, 2011.

	As at December 31, 2011
	Payments Due in Period
	Total		Less than 1 Year		1 to 3 years		3 to 5 years		More than 5 years
(Thousands of U.S. Dollars)
Oil transportation services	$	38,059	$	13,280	$	8,029	$	7,100	$	9,650
Drilling and geological and geophysical		41,034		39,550		1,484		-		-
Completions		23,053		15,273		7,780		-		-
Facility construction		32,195		15,673		16,522		-		-
Operating leases		7,798		4,567		2,779		452		-
Software and telecommunication		3,196		2,587		609		-		-
Consulting		897		843		54		-		-
Total	$	146,232	$	91,773	$	37,257	$	7,552	$	9,650