INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income tax Expense Benefit
(Loss) income before recovery of income taxes	$ (18,000)	$ (236,263)	$ 174,955
Current:
Total	39,891	27,333	14,500
Deferred:
Total	(217,450)	(55,403)	(16,000)
Provision for (recovery of) income taxes	(177,559)	(28,070)	(1,500)
Canada
Income tax Expense Benefit
Domestic	(41,374)	(127,269)	(81,978)
Current:
Domestic	3,554	5,860
Deferred:
Domestic	(21,763)	(49,820)
Outside of Canada
Income tax Expense Benefit
Foreign	23,374	(108,994)	256,933
Current:
Foreign	36,337	21,473	14,500
Deferred:
Foreign	$ (195,687)	$ (5,583)	$ (16,000)