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Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Unlimited common shares, no par value
Unlimited preferred shares in series, no par value
Common shares, shares issued	55,294,091	48,455,601

Issuance value per share of no-par value, nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

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