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Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash dividends paid on common shares, per share $ 0.21 $ 0.21 $ 0.21
Issuance under equity compensation plans, shares 238,290 140,561 74,971
Issuance under public stock offering, shares 0 2,743,900 1,931,610