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INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Income Tax Disclosure [Abstract]          
Income taxes $ 23,558 $ 37,577 $ 47,947 $ 63,579  
Pre-tax income 94,434 $ 114,866 $ 187,141 $ 197,292  
Effective income tax rate (as a percent)     25.60% 32.20%  
Unrecognized tax benefits 15,533   $ 15,533    
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense 8,328   8,328    
Reasonably possible reduction in prior years' unrecognized tax benefits during the next twelve months $ (3,138)   $ (3,138)    
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority         $ (24,976)
Interest Received On Income Tax Examination Refund From Settlement With Taxing Authority         $ 1,596