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Employee Stock Purchase Plans (Details)	12 Months Ended
Employee Stock Purchase Plans (Details)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Stock Purchase Plan [Abstract]
Purchase Price (% of Market Price on Purchase Date)	95.00%
Maximum Employee Subscription Rate (% of Gross Wages)	10.00%
Stock Issued During Period, Employee Stock Purchase Plans (in shares)	139,000	127,000	139,000

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

Number of shares issued during the period as a result of an employee stock purchase plan.