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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
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Shareholders' equity: |  |
Capital stock, par value (in dollars per share) | $ 0 | $ 0
Capital stock, shares authorized (in shares) | 0 | 0
Capital stock, shares outstanding (in shares) | 71,503,883 | 61,919,752

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