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Common Stock (Details)	3 Months Ended		6 Months Ended
Common Stock (Details)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Common Stock
Common stock outstanding	66,865,176		66,865,176		66,660,551
Common stock, issued upon the exercise of stock options	12,000	12,000	207,875	136,341

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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