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Defined Contribution Benefit Plan
 12 Months Ended
Dec. 31, 2011
Defined Contribution Benefit Plan  
Defined Contribution Benefit Plan

12.   Defined Contribution Benefit Plan

        We maintain a defined contribution benefit plan under Section 401(k) of the Internal Revenue Code. Almost all of our domestic full-time employees are eligible to participate in this plan. Under the plan during 2011, we provided matching contributions of fifty cents for every dollar employees contribute up to a maximum of $3,000. During 2012, we will provide matching contributions of fifty cents for every dollar employees contribute, up to the lesser of 3% of the employee's eligible compensation or $7,500. Generally, the plan calls for vesting of Company contributions over the initial five years of a participant's employment. We maintain a similar type of contribution plan at one of our foreign subsidiaries. Our contributions to these plans in 2011, 2010 and 2009 were $2.1 million, $1.7 million and $0.9 million, respectively.