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EMPLOYEE BENEFIT PLANS (Summary of Stock Options and Stock Appreciation Rights Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Shares    
Outstanding at beginning of period (in shares) 2,077  
Granted (in shares) 0  
Exercised (in shares) (14)  
Forfeited or expired (in shares) (60)  
Outstanding at end of period (in shares) 2,003 2,077
Exercisable at end of period (in shares) 1,417  
Weighted- Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 50.14  
Granted (in dollars per share) 0.00  
Exercised (in dollars per share) 13.65  
Forfeited or expired (in dollars per share) 48.38  
Outstanding at end of period (in dollars per share) 50.44 $ 50.14
Exercisable at end of period (in dollars per share) $ 55.82  
Weighted- Average Remaining Contractual Term    
Outstanding 1 year 9 months 18 days 2 years
Exercisable at end of period 1 year 9 months 18 days  
Aggregate Intrinsic Value    
Aggregate intrinsic value outstanding $ 307 $ 0
Exercised 0  
Exercisable at end of period $ 307