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Employee Benefit Plan	12 Months Ended
	Dec. 31, 2011
Employee Benefit Plan [Abstract]
Employee Benefit Plan	14. Employee Benefit Plan The Company sponsors a 401(k) tax-deferred savings plan for all employees who meet certain eligibility requirements. Participants may contribute, on a pre-tax basis, a percentage of their annual compensation, but not to exceed a maximum contribution amount pursuant to Section 401(k) of the Internal Revenue Code. The Company, at the discretion of the board of directors, may make additional matching contributions on behalf of the participants. The Company made matching contributions totaling $1.3 million, $0.7 million and $0.6 million in 2011, 2010 and 2009.

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- Definition

The entire disclosure for pension and other postretirement benefits.

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