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Stock Repurchase Program (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Aug. 27, 2010
Stock Repurchased Program (Textual) [Abstract]
Common stock authorized by board of directors			$ 100
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares outstanding	51,288,750	50,838,863
Board of directors authorization expiration date	Sep 2012
Stock Repurchased During Period, Value	12.6
Stock Repurchased Shares	209,300
Remaining Authorization	$ 87.4

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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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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