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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
PREFERRED COMMON STOCK 0 3,000 5,000
TREASURY STOCK - COMMON
     
Purchase of shares for company benefit plans, shares 652,443 425,140 351,163
Release of shares from company benefit plans, shares 57,252 93,906 7,069