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EMPLOYEE BENEFIT PLANS (Summary of Stock Options and Stock Appreciation Rights Outstanding and Exercisable) (Details)
shares in Thousands
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Cash Stock Appreciation Rights  
Stock-based compensation plans disclosures  
Equity instruments other than options outstanding, number of shares (in shares) | shares 61
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 36.73
Equity instruments other than options outstanding, weighted- average remaining contractual term 1 year
Equity instruments other than options exercisable, number of shares (in shares) | shares 38
Equity instruments other than options exercisable, weighted- average exercise price (in dollars per share) $ 36.73
Stock options  
Stock-based compensation plans disclosures  
Stock options outstanding, number of shares (in shares) | shares 289
Stock options outstanding, weighted- average exercise price (in dollars per share) $ 86.74
Stock options outstanding, weighted- average remaining contractual term 2 years 8 months 12 days
Stock options exercisable, number of shares (in shares) | shares 289
Stock options exercisable, weighted- average exercise price (in dollars per share) $ 86.74
Stock appreciation rights  
Stock-based compensation plans disclosures  
Equity instruments other than options outstanding, number of shares (in shares) | shares 1,727
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 44.48
Equity instruments other than options outstanding, weighted- average remaining contractual term 2 years
Equity instruments other than options exercisable, number of shares (in shares) | shares 1,156
Equity instruments other than options exercisable, weighted- average exercise price (in dollars per share) $ 47.94
$29.78 - $47.99 | Cash Stock Appreciation Rights  
Stock-based compensation plans disclosures  
Equity instruments other than options outstanding, lower range (in dollars per share) 29.78
Equity instruments other than options outstanding, upper range (in dollars per share) $ 47.99
Equity instruments other than options outstanding, number of shares (in shares) | shares 61
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 36.73
Equity instruments other than options outstanding, weighted- average remaining contractual term 1 year
Equity instruments other than options exercisable, number of shares (in shares) | shares 38
Equity instruments other than options exercisable, weighted- average exercise price (in dollars per share) $ 36.73
$29.78 - $47.99 | Stock options  
Stock-based compensation plans disclosures  
Stock options outstanding, lower range (in dollars per share) 29.78
Stock options outstanding, upper range (in dollars per share) $ 47.99
Stock options outstanding, number of shares (in shares) | shares 43
Stock options outstanding, weighted- average exercise price (in dollars per share) $ 38.40
Stock options outstanding, weighted- average remaining contractual term 1 year 9 months 18 days
Stock options exercisable, number of shares (in shares) | shares 43
Stock options exercisable, weighted- average exercise price (in dollars per share) $ 38.40
$29.78 - $47.99 | Stock appreciation rights  
Stock-based compensation plans disclosures  
Equity instruments other than options outstanding, lower range (in dollars per share) 29.78
Equity instruments other than options outstanding, upper range (in dollars per share) $ 47.99
Equity instruments other than options outstanding, number of shares (in shares) | shares 1,452
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 38.01
Equity instruments other than options outstanding, weighted- average remaining contractual term 1 year 7 months 6 days
Equity instruments other than options exercisable, number of shares (in shares) | shares 916
Equity instruments other than options exercisable, weighted- average exercise price (in dollars per share) $ 38.14
$13.65 - $29.49 | Stock options  
Stock-based compensation plans disclosures  
Stock options outstanding, lower range (in dollars per share) 13.65
Stock options outstanding, upper range (in dollars per share) $ 29.49
Stock options outstanding, number of shares (in shares) | shares 35
Stock options outstanding, weighted- average exercise price (in dollars per share) $ 14.12
Stock options outstanding, weighted- average remaining contractual term 10 months 25 days
Stock options exercisable, number of shares (in shares) | shares 35
Stock options exercisable, weighted- average exercise price (in dollars per share) $ 14.12
$13.65 - $29.49 | Stock appreciation rights  
Stock-based compensation plans disclosures  
Equity instruments other than options outstanding, lower range (in dollars per share) 13.65
Equity instruments other than options outstanding, upper range (in dollars per share) $ 29.49
Equity instruments other than options outstanding, number of shares (in shares) | shares 66
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 29.49
Equity instruments other than options outstanding, weighted- average remaining contractual term 4 years 8 months 12 days
Equity instruments other than options exercisable, number of shares (in shares) | shares 34
Equity instruments other than options exercisable, weighted- average exercise price (in dollars per share) $ 29.49
$55.04 - $83.83 | Stock options  
Stock-based compensation plans disclosures  
Stock options outstanding, lower range (in dollars per share) 55.04
Stock options outstanding, upper range (in dollars per share) $ 83.83
Stock options outstanding, number of shares (in shares) | shares 87
Stock options outstanding, weighted- average exercise price (in dollars per share) $ 81.35
Stock options outstanding, weighted- average remaining contractual term 2 years 8 months 12 days
Stock options exercisable, number of shares (in shares) | shares 87
Stock options exercisable, weighted- average exercise price (in dollars per share) $ 81.35
$55.04 - $83.83 | Stock appreciation rights  
Stock-based compensation plans disclosures  
Equity instruments other than options outstanding, lower range (in dollars per share) 55.04
Equity instruments other than options outstanding, upper range (in dollars per share) $ 83.83
Equity instruments other than options outstanding, number of shares (in shares) | shares 124
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 79.15
Equity instruments other than options outstanding, weighted- average remaining contractual term 3 years 9 months 18 days
Equity instruments other than options exercisable, number of shares (in shares) | shares 120
Equity instruments other than options exercisable, weighted- average exercise price (in dollars per share) $ 79.62
$95.91 - $131.46 | Stock options  
Stock-based compensation plans disclosures  
Stock options outstanding, lower range (in dollars per share) 95.91
Stock options outstanding, upper range (in dollars per share) $ 131.46
Stock options outstanding, number of shares (in shares) | shares 124
Stock options outstanding, weighted- average exercise price (in dollars per share) $ 127.98
Stock options outstanding, weighted- average remaining contractual term 3 years 7 months 6 days
Stock options exercisable, number of shares (in shares) | shares 124
Stock options exercisable, weighted- average exercise price (in dollars per share) $ 127.98
$95.91 - $131.46 | Stock appreciation rights  
Stock-based compensation plans disclosures  
Equity instruments other than options outstanding, lower range (in dollars per share) 95.91
Equity instruments other than options outstanding, upper range (in dollars per share) $ 131.46
Equity instruments other than options outstanding, number of shares (in shares) | shares 85
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 115.60
Equity instruments other than options outstanding, weighted- average remaining contractual term 3 years 2 months 12 days
Equity instruments other than options exercisable, number of shares (in shares) | shares 86
Equity instruments other than options exercisable, weighted- average exercise price (in dollars per share) $ 115.60