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INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
Income taxes (Note 12) $ 22,052 $ 19,558
Pre-tax income $ 77,900 $ 73,182
Effective income tax rate (as a percent) 28.30% 26.70%
Unrecognized tax benefits $ 13,934  
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense 10,115  
Reasonably possible reduction in prior years' unrecognized tax benefits during the next twelve months $ 1,431