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CAPITAL STOCK (Details) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cumulative preferred stock, shares outstanding (in shares) 0 0  
Balance at beginning of period, treasury stock (in shares) 53,796,859    
Balance at end of period, treasury stock (in shares) 55,971,691 53,796,859  
Shares retained after settlement of restricted stock units (in shares) 26,107 39,075 36,585
Shares retained after settlement of performance share units (in shares) 6,737 1,027 9,334
Outstanding Common Stock [Member]      
Balance at beginning of period, common stock (in shares) 55,862,360 56,328,863 58,804,314
Exercise of stock options (in shares) 232,052 930,258 407,542
Settlement of restricted stock units, net of 26,107, 39,075 and 36,585 shares retained, respectively (in shares) 52,182 80,988 103,331
Settlement of performance share units, net of 6,737, 1,027 and 9,334 shares retained, respectively (in shares) 14,027 1,911 13,978
Purchase of treasury shares (in shares) (2,473,093) (1,479,660) (3,000,302)
Balance at end of period, common stock (in shares) 53,687,528 55,862,360 56,328,863
Treasury Stock [Member]      
Balance at beginning of period, treasury stock (in shares) 53,796,859 53,330,356 50,854,905
Exercise of stock options (in shares) (232,052) (930,258) (407,542)
Settlement of restricted stock units, net of 26,107, 39,075 and 36,585 shares retained, respectively (in shares) (52,182) (80,988) (103,331)
Settlement of performance share units, net of 6,737, 1,027 and 9,334 shares retained, respectively (in shares) (14,027) (1,911) (13,978)
Purchase of treasury shares (in shares) 2,473,093 1,479,660 3,000,302
Balance at end of period, treasury stock (in shares) 55,971,691 53,796,859 53,330,356