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DISCLOSURE OF CHANGES IN NUMBER OF SHARES - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Treasury stock (4,377,458) (2,169,178)  
Common Stock - Outstanding 99,942,845 102,068,981  
Common Stock      
Beginning balance 104,238,159 104,058,684 103,816,185
Issuance of stock 82,144 179,475 242,499
Balance at end of year 104,320,303 104,238,159 104,058,684
Treasury stock (4,377,458) (2,169,178) (267,752)
Common Stock - Outstanding 99,942,845 102,068,981 103,790,932
Preferred Stock      
Beginning balance 2,006,391 2,006,391 2,006,391
Balance at end of year 2,006,391 2,006,391 2,006,391