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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY      
Common stock issued in exchange for preferred stock and accrued and unpaid dividends (in shares)     5,620,117
Common stock issued under common stock offerings and stock plans (in shares)     34,599,585
Common stock purchased (sold) by directors' deferred compensation plan (in shares) 1,782 4,291 (193)
Cash dividends (in dollars per share) $ 0.16