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CAPITAL STOCK (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cumulative preferred stock, shares outstanding (in shares) 0 0  
Balance at beginning of period, treasury stock (in shares) 50,854,905    
Exercise of stock options (in shares) 409,269 317,110 587,441
Balance at end of period, treasury stock (in shares) 53,330,356 50,854,905  
Shares retained after settlement of restricted stock units (in shares) 36,585 41,128 73,496
Shares retained after settlement of performance share units (in shares) 9,334 6,765 9,971
Outstanding Common Stock [Member]      
Balance at beginning of period, common stock (in shares) 58,804,314 62,028,708 67,432,041
Exercise of stock options (in shares) 407,542 315,171 580,947
Settlement of restricted stock units, net of 36,585, 41,128 and 73,496 shares retained, respectively (in shares) 103,331 78,310 145,757
Settlement of performance share units, net of 9,334, 6,765 and 9,971 shares retained, respectively (in shares) 13,978 11,806 15,956
Purchase of treasury shares (in shares) (3,000,302) (3,629,681) (6,145,993)
Balance at end of period, common stock (in shares) 56,328,863 58,804,314 62,028,708
Treasury Stock [Member]      
Balance at beginning of period, treasury stock (in shares) 50,854,905 47,630,511 42,227,178
Exercise of stock options (in shares) (407,542) (315,171) (580,947)
Settlement of restricted stock units, net of 36,585, 41,128 and 73,496 shares retained, respectively (in shares) (103,331) (78,310) (145,757)
Settlement of performance share units, net of 9,334, 6,765 and 9,971 shares retained, respectively (in shares) (13,978) (11,806) (15,956)
Purchase of treasury shares (in shares) 3,000,302 3,629,681 6,145,993
Balance at end of period, treasury stock (in shares) 53,330,356 50,854,905 47,630,511