Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2011

Supplemental Cash Flow Information [Abstract]

Changes in operating assets and liabilities

	Year Ended			Year Ended			Year Ended
	December 31, 2011			December 31, 2010			December 31, 2009
	$			$			$
Accounts receivable		(68,914	)		(21,820	)		64,886
Prepaid expenses and other assets		(8,225	)		12,719			35,006
Accounts payable		12,216			(11,002	)		(2,731	)
Accrued and other liabilities		(19,424	)		65,518			26,240
Other long-term liabilities		—			—			25,254
		(84,347	)		45,415			148,655