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Defined Contribution Plan
12 Months Ended
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Defined Contribution Plan
Note 17—Defined Contribution Plan
On January 1, 2004, we established a defined contribution savings plan under Section 401(k) of the Internal Revenue Code. Employees who have attained at least 21 years of age are generally eligible to participate in the plan on the first day of the calendar month following the month in which they commence service with us. Participants may make pre-tax contributions to the plan from their eligible earnings up to the statutorily prescribed annual limit on pre-tax contributions under the code. We may contribute to the plan at the discretion of our board of directors. Effective January 1, 2010, our board elected to include a discretionary employer matching contribution equal to 50% of the first 6% of the participant’s eligible compensation as defined by the Plan. Our contributions are allocated in the same manner as that of the participant’s elective contributions. We made contributions to the plan of $1.2 million, $0.9 million, and $0.7 million for the years ended December 31, 2012, 2011, and 2010, respectively.