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INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Tax expense	$ 33,588	$ 26,153	$ 91,431	$ 86,715
Pre-tax income	97,840	90,889	295,053	281,965
Effective income tax rate (as a percent)			31.00%	30.80%
Unrecognized tax benefits	24,084		24,084
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense	14,130		14,130
Reasonably possible reduction in prior years' unrecognized tax benefits during the next twelve months	(3,619)		(3,619)
Possible increase in Canadian federal and provincial tax due to reassessment	60,711		60,711
Possible interest on Canadian tax reassessment	16,536		16,536
Tax deposit	$ 86,827		$ 86,827
Interest percentage charged on tax assessment	5.00%		5.00%
Rate of interest to be earned on tax deposit upon favorable outcome	1.00%		1.00%

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Reflects the possible increase to tax expense that would be recorded upon an unfavorable outcome of litigation arising from income tax examinations.

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Represents the rate of interest to be earned on tax deposits made on disputed tax assessments in the event of a favorable outcome.

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Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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