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CAPITAL STOCK (Tables)
 12 Months Ended
Dec. 31, 2018
CAPITAL STOCK [Abstract]  
Schedule of Capital Stock
The activity related to outstanding common stock and common stock held in treasury was as follows:
 
2018
 
2017
 
2016
 
Outstanding Common Stock
Treasury Stock
 
Outstanding Common Stock
Treasury Stock
 
Outstanding Common Stock
Treasury Stock
Balance at beginning of period
56,328,863

53,330,356

 
58,804,314

50,854,905

 
62,028,708

47,630,511

Exercise of stock options
930,258

(930,258
)
 
407,542

(407,542
)
 
315,171

(315,171
)
Settlement of restricted stock units, net of 39,075, 36,585 and 41,128 shares retained, respectively
80,988

(80,988
)
 
103,331

(103,331
)
 
78,310

(78,310
)
Settlement of performance share units, net of 1,027, 9,334 and 6,765 shares retained, respectively
1,911

(1,911
)
 
13,978

(13,978
)
 
11,806

(11,806
)
Purchase of treasury shares
(1,479,660
)
1,479,660

 
(3,000,302
)
3,000,302

 
(3,629,681
)
3,629,681

Balance at end of period
55,862,360

53,796,859

 
56,328,863

53,330,356

 
58,804,314

50,854,905