Accounts Receivable and Inventory (Tables)

12 Months Ended

Dec. 31, 2011

Accounts Receivable and Inventory [Abstract]

Components of Accounts Receivable

	As at December 31,
(Thousands of U.S. Dollars)	2011		2010
Trade	$	45,922		$	34,182
Other		23,440			8,853
Total	$	69,362		$	43,035