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EMPLOYEE BENEFIT PLANS (Summary of Stock Options and Stock Appreciation Rights Outstanding and Exercisable) (Details)
shares in Thousands
 6 Months Ended
Jun. 30, 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 8 months 12 days
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 275
Stock options outstanding, weighted- average exercise price (in dollars per share) $ 90.16
Stock options outstanding, weighted- average remaining contractual term 2 years 6 months
Stock options exercisable, number of shares (in shares) | shares 275
Stock options exercisable, weighted- average exercise price (in dollars per share) $ 90.16
Stock appreciation rights  
Stock-based compensation plans disclosures  
Equity instruments other than options outstanding, number of shares (in shares) | shares 1,667
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 44.40
Equity instruments other than options outstanding, weighted- average remaining contractual term 1 year 8 months 12 days
Equity instruments other than options exercisable, number of shares (in shares) | shares 1,104
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 8 months 12 days
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 6 months
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 1,423
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 37.93
Equity instruments other than options outstanding, weighted- average remaining contractual term 1 year 3 months 19 days
Equity instruments other than options exercisable, number of shares (in shares) | shares 895
Equity instruments other than options exercisable, weighted- average exercise price (in dollars per share) $ 38.00
$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 22
Stock options outstanding, weighted- average exercise price (in dollars per share) $ 14.41
Stock options outstanding, weighted- average remaining contractual term 7 months 6 days
Stock options exercisable, number of shares (in shares) | shares 22
Stock options exercisable, weighted- average exercise price (in dollars per share) $ 14.41
$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 48
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 6 years 1 month 6 days
Equity instruments other than options exercisable, number of shares (in shares) | shares 16
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 4 months 24 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 110
Equity instruments other than options outstanding, weighted- average exercise price (in dollars per share) $ 79.03
Equity instruments other than options outstanding, weighted- average remaining contractual term 4 years
Equity instruments other than options exercisable, number of shares (in shares) | shares 107
Equity instruments other than options exercisable, weighted- average exercise price (in dollars per share) $ 79.55
$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 123
Stock options outstanding, weighted- average exercise price (in dollars per share) $ 127.98
Stock options outstanding, weighted- average remaining contractual term 3 years 2 months 12 days
Stock options exercisable, number of shares (in shares) | shares 123
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 86
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 2 years 7 months 6 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