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Condensed Consolidated Statement of Shareholders' Equity Parenthetical (USD $)
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash dividends paid on common shares, per share $ 0.105 $ 0.105
Issuance under equity compensation plans, shares 105,417 39,482
Issuance under public stock offering, shares 2,743,900 0
Issuance under private stock offering, shares 0 1,931,610