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CAPITAL STOCK (Tables)
 12 Months Ended
Dec. 31, 2019
CAPITAL STOCK [Abstract]  
Schedule of Capital Stock The activity related to outstanding common stock and common stock held in treasury was as follows:
 
2019
 
2018
 
2017
 
Outstanding Common Stock
Treasury Stock
 
Outstanding Common Stock
Treasury Stock
 
Outstanding Common Stock
Treasury Stock
Balance at beginning of period
55,862,360

53,796,859

 
56,328,863

53,330,356

 
58,804,314

50,854,905

Exercise of stock options
232,052

(232,052
)
 
930,258

(930,258
)
 
407,542

(407,542
)
Settlement of restricted stock units, net of 26,107, 39,075 and 36,585 shares retained, respectively
52,182

(52,182
)
 
80,988

(80,988
)
 
103,331

(103,331
)
Settlement of performance share units, net of 6,737, 1,027 and 9,334 shares retained, respectively
14,027

(14,027
)
 
1,911

(1,911
)
 
13,978

(13,978
)
Purchase of treasury shares
(2,473,093
)
2,473,093

 
(1,479,660
)
1,479,660

 
(3,000,302
)
3,000,302

Balance at end of period
53,687,528

55,971,691

 
55,862,360

53,796,859

 
56,328,863

53,330,356