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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Class of Stock [Line Items]        
Repurchase and retirement of common stock     $ 34,811 $ 130,314
Other than accelerated share repurchase program        
Class of Stock [Line Items]        
Remaining authorized repurchase amount (up to) $ 264,900   $ 264,900  
Repurchase of common stock (in shares) 311,593 484,256 376,309 1,142,415
Repurchase and retirement of common stock $ 29,000 $ 35,500 $ 34,800 $ 80,300
Repurchase of common stock (in USD per share) $ 93.09 $ 73.25 $ 92.51 $ 70.29
Accelerated share repurchase program        
Class of Stock [Line Items]        
Repurchase of common stock (in shares)     673,212  
Repurchase and retirement of common stock       $ 50,000
Repurchase of common stock (in USD per share)     $ 74.27