INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income taxes (Note 15)	$ 18,040	$ 25,404	$ 39,492	$ 48,782
Pre-tax income	103,484	$ 94,263	$ 196,402	$ 178,461
Effective income tax rate (as a percent)			20.10%	27.30%
Unrecognized tax benefits	26,157		$ 26,157
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense	22,597		22,597
Reasonably possible reduction in prior years' unrecognized tax benefits during the next twelve months	$ 5,379		$ 5,379