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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Class of Stock [Line Items]        
Repurchase of common stock (in shares)     673,212  
Repurchase of common stock     $ 5,820 $ 82,836
Repurchase of common stock (in USD per share)     $ 74.27  
Other than accelerated share repurchase program        
Class of Stock [Line Items]        
Remaining authorized repurchase amount (up to) $ 293,900   $ 293,900  
Repurchase of common stock (in shares) 64,716 609,343 64,716 658,159
Repurchase of common stock $ 5,800 $ 41,900 $ 5,800 $ 44,800
Repurchase of common stock (in USD per share) $ 89.70 $ 68.82 $ 89.70 $ 68.12