INCOME TAXES (Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of the year	$ 25,255	$ 26,656
Increase related to current year tax provisions	1,990	3,838
Increase related to prior years' tax positions	208	212
Increase related to acquisitions	3,528	1,274
Decrease related to settlements with taxing authorities	(95)	(940)
Resolution of and other decreases in prior years' tax liabilities	(3,491)	(5,964)
Other	(1,488)	179
Balance at the end of the year	25,907	25,255
Interest and penalties expense (benefit)	492	893
Accrued interest and penalties	10,257	10,295
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate	13,739	14,839
Reasonably possible further reduction in prior years' unrecognized tax benefits during the next twelve months	4,284
Possible increase in Canadian federal and provincial tax due to reassessment	58,824
Possible interest on Canadian tax reassessment	16,022
Interest percentage charged on tax assessment (percent)	5.00%
Rate of interest to be earned on tax deposit upon favorable outcome (percent)	1.00%
Tax deposit	$ 84,128