Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans

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Employee Benefit Plans
12 Months Ended
Dec. 31, 2011
Employee Benefit Plans [Abstract]  
Employee Benefit Plans
12. Employee Benefit Plans
In 1998, our board of directors approved a defined contribution plan that provides retirement benefits under the provisions of Selection 401(k) of the Internal Revenue Code. Our 401(k) Plan (“Plan”) covers substantially all employees who meet a minimum service requirement. Under the Plan, we can elect to make voluntary contributions. Contributions of $0.7 million, $0.5 million and $0.4 million were made by us for the years ended December 31, 2011, 2010 and 2009, respectively.