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SHAREHOLDERS' EQUITY (Common Shares Issued and Outstanding) (Details) - shares
shares in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Shares issued, balance at beginning of period (in shares) 176,580    
Total shares issued at end of period (in shares) 176,580    
Treasury shares, balance at beginning of period (93,419)    
Total treasury shares at end of period (in shares) (93,062)    
Total shares outstanding (in shares) 83,518   83,161
Common stocks      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Shares issued, balance at beginning of period (in shares) 176,580 176,580  
Shares issued (in shares) 0 0  
Total shares issued at end of period (in shares) 176,580 176,580  
Treasury shares, balance at beginning of period (93,419) (90,139)  
Shares repurchased (in shares) (149) (2,229)  
Shares reissued (in shares) 506 958  
Total treasury shares at end of period (in shares) (93,062) (91,410)  
Total shares outstanding (in shares) 83,518 85,170