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INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Income taxes (Note 14) $ 25,404 $ 22,635 $ 48,782 $ 44,687
Pre-tax income 94,263 $ 83,966 $ 178,461 $ 161,866
Effective income tax rate (as a percent)     27.30% 27.60%
Transition Tax Expense Benefit Net Resulting from Tax Reform Act     $ 2,500  
Unrecognized tax benefits 15,837   15,837  
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense 12,231   12,231  
Reasonably possible reduction in prior years' unrecognized tax benefits during the next twelve months $ 1,973   $ 1,973