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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Income taxes (Note 15) $ 19,340 $ 25,209 $ 58,832 $ 73,991
Pre-tax income 91,797 $ 95,744 $ 288,199 $ 274,205
Effective income tax rate (as a percent)     20.40% 27.00%
Unrecognized tax benefits 22,083   $ 22,083  
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense 18,590   18,590  
Reasonably possible reduction in prior years' unrecognized tax benefits during the next twelve months $ 1,470   $ 1,470