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CAPITAL STOCK (Tables)
 12 Months Ended
Dec. 31, 2015
CAPITAL STOCK [Abstract]  
Schedule of Capital Stock
The Company had no shares of preferred stock outstanding as of December 31, 2015 and 2014. The activity related to outstanding common stock and common stock held in treasury was as follows:
 
2015
 
2014
 
Outstanding Common Stock
Treasury Stock
 
Outstanding Common Stock
Treasury Stock
Balance at beginning of period
67,432,041

42,227,178

 
68,853,938

40,805,281

Exercise of stock options, net of 2,101 and 1,905 shares swapped in stock-for-stock exchange, respectively
580,947

(580,947
)
 
477,547

(477,547
)
Settlement of restricted stock units, net of 73,496 and 104,552 shares retained, respectively
145,757

(145,757
)
 
175,549

(175,549
)
Settlement of performance share units, net of 9,971 and 33,003 shares retained, respectively
15,956

(15,956
)
 
51,337

(51,337
)
Purchase of treasury shares
(6,145,993
)
6,145,993

 
(2,126,330
)
2,126,330

Balance at end of period
62,028,708

47,630,511

 
67,432,041

42,227,178