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EARNINGS PER SHARE Accelerated Share Repurchase (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2015
Accelerated Share Repurchases [Line Items]          
Payments for Repurchase of Common Stock     $ (106,702) $ (4,073)  
Stock Repurchase Program, Authorized Amount $ 300,000   $ 300,000    
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) $ (50,000)     $ (150,000)
Treasury Stock, Shares, Acquired 974,246 804,291      
Treasury Stock, Common, Shares 2,468,576   2,468,576