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INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income taxes (Note 14)	$ 25,209		$ 24,531	$ 73,991	$ 69,218
Pre-tax income	95,744		$ 130,642	$ 274,205	$ 292,508
Effective income tax rate (as a percent)				27.00%	23.70%
Transition Tax Expense Benefit Net Resulting from Tax Reform Act	2,394	$ 2,500
Unrecognized tax benefits	15,683			$ 15,683
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense	12,075			12,075
Reasonably possible reduction in prior years' unrecognized tax benefits during the next twelve months	$ 2,000			$ 2,000

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