INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income taxes (Note 15)	$ 21,452	$ 23,378
Pre-tax income	$ 92,918	$ 84,198
Effective income tax rate (as a percent)	23.10%	27.80%
Unrecognized tax benefits	$ 27,866
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense	24,328
Reasonably possible reduction in prior years' unrecognized tax benefits during the next twelve months	$ 1,753