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Employee benefit plan	12 Months Ended
Employee benefit plan	Dec. 31, 2012
Employee benefit plan
Employee benefit plan	14. Employee benefit plan We have a defined contribution savings plan in accordance with Section 401(k) of the Internal Revenue Code. This plan covers substantially all employees who meet the IRS requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. Company contributions to the plan may be made at the discretion of the board of directors. Employer contributions of $347, $285 and $244 were made to the plan by us in 2012, 2011 and 2010, respectively.

The entire disclosure for pension and other postretirement benefits.

+ References

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-Name Statement of Financial Accounting Standard (FAS)

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-Name Accounting Standards Codification

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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