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Employee Benefits	12 Months Ended
Employee Benefits	Dec. 31, 2011
Employee Benefits [Abstract]
Employee Benefits	(14) Employee Benefits The Company sponsors defined contribution retirement plans for its employees, the principal plan being the 401(k) plan which is offered to its employees in the United States. During 2011, the Company matched 50% of employee contributions up to 3.0% of the employee's salary (for a maximum matching contribution of 1.5% of the employee's salary by the Company). Employees immediately vest in their contributions while the Company's matching contributions vest at a rate of 20% per year. The Company also sponsors a similar plan for its employees in the United Kingdom. The Company contributed $0.4 million, $0.3 million, and $0.3 million to the defined contribution benefit plans for the years ended December 31, 2011, 2010, and 2009, respectively.