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INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Tax expense	$ 34,007	$ 31,792	$ 57,843	$ 60,562
Pre-tax income	106,534	98,157	197,213	191,076
Effective income tax rate (as a percent)			29.30%	31.70%
Unrecognized tax benefits	25,121		25,121
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense	15,162		15,162
Reasonably possible reduction in prior years' unrecognized tax benefits during the next twelve months	(4,627)		(4,627)
Possible increase in Canadian federal and provincial tax due to reassessment	58,563		58,563
Possible interest on Canadian tax reassessment	16,174		16,174
Tax deposit	$ 84,112		$ 84,112
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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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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