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Employee Stock Purchase Plan	12 Months Ended
Employee Stock Purchase Plan	Dec. 31, 2011
Employee Stock Purchase Plan [Abstract]
Employee Stock Purchase Plan	(12) Employee Stock Purchase Plan We had an employee stock purchase plan (“ESPP”) which permitted employees to purchase our common stock at a 5% discount based on the average price of the stock on the last business day of the offering period (calendar quarter basis). Purchases were funded by employee payroll deductions during the offering period. We discontinued our ESPP plan at the beginning of 2009. Employees purchased 342,561 shares in 2009 under this plan.