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CAPITAL STOCK (Details) - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cumulative preferred stock, shares outstanding (in shares) 0 0  
Balance at beginning of period, treasury stock (in shares) 53,330,356    
Exercise of stock options (in shares) 931,929 409,269 317,110
Balance at end of period, treasury stock (in shares) 53,796,859 53,330,356  
Shares retained after settlement of restricted stock units (in shares) 39,075 36,585 41,128
Shares retained after settlement of performance share units (in shares) 1,027 9,334 6,765
Outstanding Common Stock [Member]      
Balance at beginning of period, common stock (in shares) 56,328,863 58,804,314 62,028,708
Exercise of stock options (in shares) 930,258 407,542 315,171
Settlement of restricted stock units, net of 39,075, 36,585 and 41,128 shares retained, respectively (in shares) 80,988 103,331 78,310
Settlement of performance share units, net of 1,027, 9,334 and 6,765 shares retained, respectively (in shares) 1,911 13,978 11,806
Purchase of treasury shares (in shares) (1,479,660) (3,000,302) (3,629,681)
Balance at end of period, common stock (in shares) 55,862,360 56,328,863 58,804,314
Treasury Stock [Member]      
Balance at beginning of period, treasury stock (in shares) 53,330,356 50,854,905 47,630,511
Exercise of stock options (in shares) (930,258) (407,542) (315,171)
Settlement of restricted stock units, net of 39,075, 36,585 and 41,128 shares retained, respectively (in shares) (80,988) (103,331) (78,310)
Settlement of performance share units, net of 1,027, 9,334 and 6,765 shares retained, respectively (in shares) (1,911) (13,978) (11,806)
Purchase of treasury shares (in shares) 1,479,660 3,000,302 3,629,681
Balance at end of period, treasury stock (in shares) 53,796,859 53,330,356 50,854,905