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EARNINGS PER SHARE Accelerated Share Repurchase (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Accelerated Share Repurchases [Line Items]        
Payments for Repurchase of Common Stock   $ (56,665) $ (740)  
Stock Repurchase Program, Authorized Amount $ 300,000 $ 300,000    
Treasury Stock, Shares, Acquired 804,291      
Stock Repurchase Program Expiration Date   Dec. 31, 2017    
Treasury Stock, Common [Member]        
Accelerated Share Repurchases [Line Items]        
Payments for Repurchase of Common Stock $ (50,000)     $ (150,000)
Treasury Stock, Common, Shares 2,468,576 2,468,576