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CAPITAL STOCK (Tables)
 12 Months Ended
Dec. 31, 2017
CAPITAL STOCK [Abstract]  
Schedule of Capital Stock
The Company had no shares of preferred stock outstanding as of December 31, 2017 and 2016. The activity related to outstanding common stock and common stock held in treasury was as follows:
 
2017
 
2016
 
2015
 
Outstanding Common Stock
Treasury Stock
 
Outstanding Common Stock
Treasury Stock
 
Outstanding Common Stock
Treasury Stock
Balance at beginning of period
58,804,314

50,854,905

 
62,028,708

47,630,511

 
67,432,041

42,227,178

Exercise of stock options
407,542

(407,542
)
 
315,171

(315,171
)
 
580,947

(580,947
)
Settlement of restricted stock units, net of 36,585, 41,128 and 73,496 shares retained, respectively
103,331

(103,331
)
 
78,310

(78,310
)
 
145,757

(145,757
)
Settlement of performance share units, net of 9,334, 6,765 and 9,971 shares retained, respectively
13,978

(13,978
)
 
11,806

(11,806
)
 
15,956

(15,956
)
Purchase of treasury shares
(3,000,302
)
3,000,302

 
(3,629,681
)
3,629,681

 
(6,145,993
)
6,145,993

Balance at end of period
56,328,863

53,330,356

 
58,804,314

50,854,905

 
62,028,708

47,630,511