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SHAREHOLDERS' EQUITY (Common Shares Issued and Outstanding) (Details) - shares
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 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   176,580    
Treasury shares, balance at beginning of period     (93,419)    
Total treasury shares at end of period (in shares) (93,024)   (93,024)    
Total shares outstanding (in shares) 83,556   83,556   83,161
Common stocks          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued, balance at beginning of period (in shares) 176,580 176,580 176,580 176,580  
Shares issued (in shares) 0 0 0 0  
Total shares issued at end of period (in shares) 176,580 176,580 176,580 176,580  
Treasury shares, balance at beginning of period (93,062) (91,410) (93,419) (90,139)  
Shares repurchased (in shares) (26) (2,004) (175) (4,233)  
Shares reissued (in shares) 64 37 570 995  
Total treasury shares at end of period (in shares) (93,024) (93,377) (93,024) (93,377)  
Total shares outstanding (in shares) 83,556 83,203 83,556 83,203