Accounts Payable and Accrued Liabilities

12 Months Ended

Dec. 31, 2011

Accounts Payable and Accrued Liabilities, Current [Abstract]

Accounts Payable and Accrued Liabilities

10.Accounts Payable and Accrued Liabilities

	As at December 31,
(Thousands of U.S. Dollars)	2011		2010
Trade	$	71,384	$	63,969
Royalties		37,936		18,064
VAT and withholding tax		24,962		16,438
Other		14,739		9,672
Total	$	149,021	$	108,143