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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	unlimited	unlimited
Common stock, shares issued	152,476,564	152,567,813
Common stock, shares outstanding	152,476,564	152,567,813

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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